References

Abel EL (1986) Childhood homicide in Erie County, New York. Pediatrics 77: 709-713.

Abel EL, Strasburger EL & Zeidenberg P (1985) Seasonal, monthly, and day-of-week trends in homicide as affected by alcohol and race. Alcohol Clin Exp Res 9: 281-283.

Abel EL & Welte JW (1987) Temporal variation in violent death in Erie County, New York, 1973-1983. Am J Forensic Med Path 8: 107-111.

Agresti A (1990) Categorical data analysis. John Wiley & Sons Inc, New York.

Altamura C, VanGastel A, Pioli R, Mannu P & Maes M (1999) Seasonal and circadian rhythms in suicide in Calgari, Italy. J Affect Disord 53: 77-85.

Altman D (1991) Practical statistics for medical research, T. J. Press, Cornwall.

American Psychiatric Association (1987) Diagnostic and Statistical Manual of Mental Disorders. Revised third edition. American Psychiatric Association, Washington DC.

American Psychiatric Association (1994) Diagnostic and Statistical Manual of Mental Disorders, fourth edition. American Psychiatric Association, Washington DC.

Anderson CA (1987) Temperature and aggression: Effects on quarterly, yearly, and city rates of violent and nonviolent crime. J Pers Soc Psychology 52: 1161-1173.

Anderson CA (1989) Temperature and aggression: ubiquitous effects of heat on occurrence of human violence. Psychol Bull 106: 74-96.

Anderson CA & Anderson DC (1984) Ambient temperature and violent crime: tests of the linear and curvilinear hypothesis. J Pers Soc Psychology 46: 91-97.

Armitage P & Berry G (1987) Statistical methods in medical research. Redwood Burn Limited, Great Britain.

Aschauer HN, Meszaros K, Willinger U, Reiter E, Heiden AM, Lenzinger E, Beran H & Resinger E (1994) The season of birth of schizophrenics and schizoaffectives. Psychopathology 27: 298-302.

Baker G & Lester D (1986) Seasonal births, academic achievement and psychopathology (suicide and homicide): a regional analysis. Psychol Rep 59: 742

Balestrieri M, Rucci P & Nicolaou S (1997) Gender-specific decline and seasonality of births in operationally defined schizophrenics in Italy. Schizophr Res 27: 73-81.

Banki CM & Arato M (1983) Amine metabolites and neuroendocrine findings, and personality dimensions as correlates of suicidal behaviour. Psychiatry Res 10: 253-261.

Barak Y, Ring A, Sulkes J, Gabbay U & Elizur A (1995) Season of birth and autistic disorder in Israel. Am J Psychiatry 152: 798-800.

Barker A, Hawton K, Fagg J & Jennison C (1994) Seasonal and weather factors in parasuicide. Br J Psychiatry 165: 375-380.

Barker DJP, Cooper C & Rose G (1998) Epidemiology in medical practice. Pearson Professional Limited, Hong Kong.

Barraclough BM & White SJ (1978a) Monthly variation of suicide and undetermined death compared. Br J Psychiatry 132: 275-278.

Barraclough BM & White SJ (1978b) Monthly variation of suicidal, accidental and undetermined poisoning deaths. Br J Psychiatry 132: 279-282.

Bazas T, Jemos J, Stefanis K & Trichopoulos D (1979) Incidence and seasonal variation of suicide mortality in Greece. Compr Psychiatry 20: 15-20.

Beskow J, Kerkhof A, Kokkola A & Uutela A (1999) Suicide prevention in Finland 1986-1996. External evaluation by an international peer group. Psychiatr Fenn 30: 31-46.

Bloomfield P (1976) Fourier analysis of time series: an introduction. John Wiley & Sons, New York.

Bowie C & Prothero D (1981) Finding causes of seasonal diseases using time series analysis. Int J Epidemiol 10: 87-92.

Box GEP & Jenkins GM (1976) Time series analysis: forecasting and control. Revised edition. Holden Day Inc., California.

Boyd JH, Pulver AE & Stewart W (1986) Season of birth: schizophrenia and bipolar disorder. Schizophr Bull 12: 173-185.

Bradbury TN & Miller GA (1985) Season of birth in schizophrenia: a review of evidence, methodology, and etiology. Psychol Bull 98: 569-594.

Brewerton TD (1991) Fluoxetine-induced suicidality, serotonin, and seasonality. Biol Psychiatry 30: 190-196.

Brown GL, Goodwin FK, Ballenger JC, Goyer PF & Major LF (1979) Aggression in humans correlates with cerebrospinal fluid amine metabolites. Psychiatry Res 1: 131-139.

Cambell MJ & Machin D (1993) Medical statistics: a commonsense approach, second edition. John Wiley & Sons, Great Britain.

Carney PA, Fitzgerald CT & Monaghan CE (1988) Influence of climate on the prevalence of mania. Br J Psychiatry 152: 820-823.

Castrogiovanni P, Iapichino S, Pacchierotti C & Pieraccini F (1998) Season of birth in psychiatry: a review. Neuropsychobiology 37: 175-181.

Cave DR & Freedman LS (1975) Seasonal variations in the clinical presentation of Crohn’s disease and ulcerative colitis. Int J Epidemiol 4: 317-320.

Chatfield C (1996) The analysis of time series: an introduction. Fifth edition. St Edmundsbury Press Ltd, Suffolk.

Chew KSY & McCleary R (1995) The spring peak in suicides: a cross-national analysis. Soc Sci Med 40: 223-230.

Clarke M, Moran P, Keogh F. Morris M, Kinsella A, Walsh D, Larkin C & O’Callaghan E (1998a) Seasonal influences on admissions in schizophrenia and affective disorder in Ireland. Schizophr Res 34: 143-149.

Clarke M, Keogh F, Murphy PT, Morris M, Larkin C, Walsh D & O’Callaghan E (1998b) Seasonality in births in affective disorder in an Irish population. Eur Psychiatry 13: 353-358.

Cleveland WS & Devlin SJ (1980) Calendar effects in monthly time series: detection by spectrum analysis and graphical methods. J Am Stat Assoc 75: 487-496.

Coccaro EF, Kavoussi RJ, Sheline YI, Lish JD & Csernansky JG (1996) Impulsive aggression in personality disorder: correlates with tritiated paroxetine binding in the platelet. Arch Gen Psychiatry 53: 531-536.

Dalen P (1990) Does age-incidence explain all season-of-birth effects in the literature? Schizophr Bull 16: 11-12.

Dallal GE (1988) Statistical microcomputing – like it is. American Statistician 42: 212-216.

DeGroot MH & Mezzich JE (1985) Psychiatric statistics. In: Atkinson AC, Fienberg SE (eds). A celebration of statistics: the ISI centenary volume. Springer, New York.

DeMaio D, Caradente F & Riva C (1982) Evaluation of circadian, circaseptan and circannual periodicity of attempted suicides. Chronobiologia 9: 185-193.

DeMet EM, Chicz-DeMet A & Fleischmann J (1989) Seasonal rhythm of platelet 3H-imipramine binding in normal controls. Biol Psychiatry 26: 489-495.

DeMet EM, Reist C, Bell KM, Gerner RH, Chicz-DeMet A, Warren S & Wu J (1991) Decreased seasonal mesor of platelet 3H-imipramine binding in depression. Biol Psychiatry 29: 427-440.

Dixon KW & Shulman MD (1983) A statistical investigation into the relationship between meteorological parameters and suicide. Int J Biometeor 27: 93-105.

Durkheim E (1970) Suicide: a study in sociology (translated from Durkeim E , Le Suicide, Paris, 1897). Lowe & Brydone Ltd, London.

Eagles JM, Hunter D & Geddes JR (1995) Gender-specific changes since 1900 in the season of birth effect in schizophrenia. Br J Psychiatry 167: 469-472.

Eastwood MR & Peacocke J (1976) Seasonal patterns of suicide, depression and electroconvulsive therapy. Br J Psychiatry 129: 472-475.

Eastwood MR & Stiasny S (1978) Psychiatric disorder, hospital admission, and season. Arch Gen Psychiatry 35: 769-771.

Edwards JH (1961) The recognition and estimation of cyclic trends. Ann Hum Genet 25: 83-86.

Eronen M (1995) Mental disorders and homicidal behavior in female subjects. Am J Psychiatry 152: 1216-1218.

Eronen M, Hakola P & Tiihonen J (1996a) Mental disorders and homicidal behaviour in Finland. Arch Gen Psychiatry 53: 497-501.

Eronen M, Tiihonen J & Hakola P (1996b) Schizophrenia and homicidal behavior. Schizophr Bull 22: 83-89.

Everitt BS & Landau S (1998) The use of multivariate statistical methods in psychiatry. Stat Meth Med Res 7: 253-277.

Faedda GL, Tondo L, Teicher MH, Baldessarini RJ, Gelbard HA & Floris GF (1993) Seasonal mood disorders: pattern of seasonal recurrence in mania and depression. Arch Gen Psychiatry 50: 17-23.

Ferreira de Castro EF Pimenta F, Martins I (1989) The truth about suicide in Portugal. Acta Psychiatr Scand 80: 334-339.

Ferreira de Castro EF, Pimenta F & Martins I (1991) Who kills whom in Portugal? Acta Psychiatr Scand 83: 92-98.

Fingerhut LA & Kleinman JC (1990). International and interstate comparisons of homicide among young males. JAMA 263: 3292-3295.

Fleiss JL, Williams JBW & Dubro AF (1986) The logistic regression analysis of psychiatric data. J Psychiatr Res 20: 145-209.

Flisher AJ, Parry CDH, Bradshaw D & Juritz JM (1997) Seasonal variation of suicide in South Africa. Psychiatry Res 66: 13-22.

Fossey E & Shapiro CM (1992) Seasonality in psychiatry - a review. Can J Psychiatry 37: 299-308.

Freedman LS (1979) The use of a Kolmogorov-Smirnov type statistic in testing hypotheses about seasonal variation. J Epidemiol Community Health 33: 223-228.

Gillberg C (1990) Do children with autism have March birthdays? Acta Psychiatr Scand 82: 152-156.

Goodman RA, Herndon JL, Istre GR, Jordan FB & Kelaghan J (1989) Fatal injuries in Oklahoma: descriptive epidemiology using medical examiner data. South Med J 82: 1128-1234.

Gotestam KG, Eriksen L, Heggestad T & Nielsen S (1998) Prevalence of eating disorders in Norwegian general hospitals 1990-1994: admissions per year and seasonality. Int J Eat Disord 23: 57-64.

Gottlieb P, Gabrielsen G & Kramp P (1988) Increasing rates of homicide in Copenhagen from 1959 to 1983. Acta Psychiatr Scand 77: 301-308.

Gudjonsson GH & Petursson H (1990) Homicide in the Nordic countries. Acta Psychiatr Scand 82: 49-54.

Halberg F (1980) Definitions and annotations. In: Sheving LE & Halberg F (eds) Chronobiology: principles and applications to shifts in schedules. Sijthoff & Noorhoff International Publishers, The Netherlands.

Hakko H, Räsänen P & Tiihonen J (1999) Cosinor modelling of suicides in Finland (reply). Acta Psychiatr Scand 99: 308-310.

Hand D & Sham P (1995) Improving the quality of statistic in psychiatric research. Br J Psychiatry 167: 689-691.

Hardt J & Gerbershagen HU (1999) No changes in mood with the seasons: observations in 3000 chronic pain patients. Acta Psychiatr Scand 100: 288-294.

Hare EH (1975) Season of birth in schizophrenia and neurosis Am J Psychiatry 132: 1168-1171.

Hare EH & Walter SD (1978) Seasonal variation in admissions of psychiatric patients and its relation to seasonal variation in their births. J Epidemiol Community Health 32: 47-52.

Haus E, Cornelissen G & Halberg F (1980) Introduction to chronobiology. In: Sheving LE & Halberg F (eds) Chronobiology: principles and applications to shifts in schedules. Sijthoff & Noorhoff International Publishers, the Netherlands.

Heikkinen M (1994) Life events and social support in suicide. Publications of the National Public Health Institute NPHI A7/1994. T-print Ky, Hyvinkää.

Heilä H (1999) Suicide and schizophrenia. A nationwide psychological autopsy study in Finland. Publications of the National Public Health Institute NPHI A4/1999. Yliopistopaino, Helsinki.

Henriksson M (1996) Mental disorders in suicide: a comorbidity approach. Publications of the National Public Health Institute, NPHI A15/1996. Hakapaino Oy, Helsinki.

Hewitt D, Milner J, Cisma A & Pakula A (1971) On Edwards’ criterion of seasonality and a non-parametric alternative. Brit J Prev Soc Med 25: 174-176.

Ho TP (1996) Changing patterns of suicide in Hong Kong. Soc Psychiatry Psychiatr Epidemiol 31: 235-240.

Ho TP, Chao A & Yip P (1997) Seasonal variation in suicides re-examined: no sex difference in Hong Kong and Taiwan. Acta Psychiatr Scand 95: 26-31.

Hodgins S (1992) Mental disorder, intellectual deficiency, and crime. Evidence from a birth cohort. Arch Gen Psychiatry 49: 476-483.

Hokanson JA, Bryant SG, Gardner R, Luttman DJ, Guernsey NG, Bienkowski AC (1986) Spectrum and frequency of use of statistical techniques in psychiatric journals. Am J Psychiatry 143: 1118-1125.

Holinger PC (1979) Violent deaths among the young: recent trends in suicide, homicide and accidents. Am J Psychiatry 136: 1144-1147.

Horn S (1977) Goodness-of-fit tests for discrete data: a review and an application to a health impairment scale. Biometrics 33: 234-248.

Hude Q & Arboleda-Florez J (1999) Elderly suicide in Alberta: difference by gender. Can J Psychiatry 44: 762-768.

Hyman JW (1990) The light book: how natural and artificial light affect our health, mood, and behavior. Jeremy P. Tarcher Inc., Los Angeles.

Isometsä E (1994a) Suicide in major mood disorders. Publications of the National Public Health Institute, KTL A5/1994, Yliopistopaino, Helsinki.

Isometsä ET, Henriksson MM, Aro HM, Heikkinen ME, Kuoppasalmi KI, Lönnqvist JK (1994b) Suicide in major depression. Am J Psychiatry 151: 530-536.

James WH (1976) The power of a test for seasonality of births with reference to schizophrenia. Br J Psychiatry 129: 94-95.

Jessen G, Andersen K, Arensman E, Bille-Brahe U, Grepet P, De Leo D, Hawton K, Haring C, Hjelmeland K, Michel K, Ostamo A, Salander-Renberg E, Schmidtke A, Temesvary B, Wasserman D (1999a). Temporal fluctuations and seasonality in attempted suicide in Europe. Findings from the WHO/EURO multicentre study on parasuicide. Arch Suic Res 5: 57-69.

Jessen G, Jensen BF, Arensman E, Bille-Brahe U, Crepet P, De Leo D, Hawton K, Haring C, Hjelmeland H, Michel K, Ostamo A, Salander-Renberg E, Schmidtke A, Temesvary B & Wasserman D (1999b) Attempted suicide and major public holidays in Europe: findings from the WHO/EURO Multicentre study on parasuicide. Acta Psychiatr Scand 99: 412-418.

Jones PK & Jones SL (1977) Lunar association with suicide. Suic Life Threat Behav 7: 31-39.

Jones RH, Ford PM & Hamman RF (1988) Seasonality comparisons among groups using incidence data. Biometrics 44: 1131-1144.

Joukamaa M (1995) Kuolema vankilassa: vankikuolemat Suomessa vuosina 1969-1992. Hakapaino Oy, Helsinki.

Joukamaa M (1997) Prison suicide in Finland, 1969-1992. Forensic Sci Int 89: 167-174.

Kasper S, Wehr TA, Bartko JJ, Gaist PA & Rosenthal NE (1989) Epidemiological findings of seasonal changes in mood and behaviour. Arch Gen Psychiatry 46: 823-833.

Kettl PA & Bixler EO (1991) Suicide in Alaska natives, 1979-1984. Psychiatry 54: 55-63.

Kevan SM (1980) Perspectives on season of suicide: a review. Soc Sci Med 14: 369-378.

Kleinbaum DG (1994) Logistic regression: a self learning textbook Springer-Verlag, Inc, New York.

Kok LP & Tsoi WF (1993) Season, climate and suicide in Singapore. Med Sci Law 33: 247-252.

Kop PPA (1977) Human aggressive behaviour: the period of perpetration in relation to month of birth of male offenders. J Biosoc Sci 9: 309-316.

Kunugi H, Nanko S, Watanabe H, Sekiba K & Kazamatsuri H (1998) Season of birth of chronic alcoholics. J Psychiatric Res 32: 321-323.

Lester D (1971) Seasonal variation in suicidal deaths. Br J Psychiatry 118: 627-628.

Lester D (1979) Temporal variation in suicide and homicide. Am J Epidemiol 109: 517-520.

Lester D (1985) Seasonal variation in suicidal deaths by each method. Psychol Rep 56: 650.

Lester D (1986) The birthday blues revisited: the timing of suicidal, homicidal and natural deaths. Acta Psychiatr Scand 73: 322-323.

Lester D & Frank ML (1988) Sex differences in the seasonal distribution of suicides. Br J Psychiatry 153: 115-117.

Levine ME & Wojcik BE (1999) Alcoholic typology and season of birth. J Addict Dis 18: 41-52.

Lewis MS (1989) Age incidence and schizophrenia: part I. The season of birth controversy. Schizophr Bull 15: 59-71.

Lewis MS & Griffin PA (1981) An explanation for the season of birth effect in schizophrenia and certain other diseases. Psychol Bull 89: 589-596.

Lidberg L, Tuck JR, Åsberg M, Scalia-Tomba GP & Bertilsson L (1985) Homicide, suicide and CSF 5-HIAA. Acta Psychiatr Scand 71: 230-236.

Lindeman S (1997) Suicide among physicians. Acta Universitatis Ouluensis Medica D 412, Oulu University Press, Oulu.

Lindqvist P & Allebeck P (1990) Schizophrenia and crime: a longitudinal follow-up of 644 schizophrenics in Stockholm. Br J Psychiatry 157: 345-350.

Linkowski P, Martin F & de Maertelaer V (1992) Effect of some climatic factors on violent and non-violent suicides in Belgium. J Affect Disord 25: 161-166.

Linnoila VM & Virkkunen M (1992) Aggression, suicidality and serotonin. J Clin Psychiatry 53: 46-51.

Linnoila M, Virkkunen M, Scheinin M, Nuutila A, Rimon R & Goodwin R (1983) Low cerebrospinal fluid 5-hydroxyindoleacetic acid concentration differentiates impulsive from non-impulsive violent behaviour. Life Sci 33: 2609-2614.

Lönnqvist J (1988) National Suicide Prevention Project in Finland: a research phase of the project. Psychiatr Fenn 19: 125-132.

Lönnqvist J (2000a) Psychiatric aspects of suicidal behaviour: depression. In: Hawton K & van Heeringen K (eds) International Handbook of suicide and attempted suicide. John Wiley & Sons, Ltd, in press.

Lönnqvist J (2000b) Epidemiology and causes of suicide. In: New Oxford Textbook of Psychiatry, in press.

Lönnqvist J, Aro H & Marttunen M (eds) (1993) Itsemurhat Suomessa 1987-projekti: Toteutus, aineisto ja tutkimustuloksia. Stakes Tutkimuksia 25, Gummerus Kirjapaino Oy, Jyväskylä.

Lönnqvist JK, Henriksson MM, Isometsä ET, Marttunen MJ, Heikkinen ME, Aro HM & Kuoppasalmi KI (1995) Mental disorders and suicide prevention. Psychiatry Clin Neurosci 49: 111-116.

MacMahon B & Pugh TF (1970) Epidemiology. Principles and methods. Little Brown, Boston MA.

MacMahon K (1983) Short-term temporal cycles in the frequency of suicides, United States, 1972-1978. Am J Epidemiol 177: 744-750.

Madden PAF, Heath AC, Rosenthal NE & Martin NG (1996) Seasonal changes in mood and behavior: the role of genetic factors. Arch Gen Psychiatry 53: 47-55.

Maes M, Cosyns P, Meltzer HY, De Meyer F & Peeters D (1993a) Seasonality in violent suicide but not in nonviolent suicide or homicide. Am J Psychiatry 150: 1380-1385.

Maes M, Meltzer HY, Suy E & De Meyer F (1993b) Seasonality in severity of depression: relationships to suicide and homicide occurrence. Acta Psychiatr Scand 88: 156-161.

Maes M, De Meyer F & Peeters D (1994) Synchronized annual rhythms in violent suicide rate, ambient temperature and the light-dark span. Acta Psychiatr Scand 90: 391-396.

Maes M, Scharpe S, D"Hondt P, Peeters D, Wauters A, Neels H & Verkerk R (1996) Biochemical, metabolic and immune correlates of seasonal variation in violent suicide: a chronoepidemiologic study. Eur J Psychiat 11:21-33.

Maes M, Scharpe S, Verkerk R, D"Hondt P, Peeters D, Cosyns P, Thompson P, De Meyer F, Wauters A & Neels H (1995) Seasonal variation in plasma L-tryptophan availability in healthy volunteers: relationships to violent suicide occurrence. Arch Gen Psychiatry 52: 937-946.

Magnusson A, Axelsson J, Karlsson MM & Oskarsson H (2000) Lack of seasonal mood change in the Icelandic population: results of a cross-sectional study. Am J Psychiatry 157: 234-238.

Maldonado G & Kraus JF (1991) Variation in suicide occurrence by time of day, day of the week, month and lunar phase. Suicide Life Threat Behav 210: 174-187.

Marazziti D, Placidi GF, Cassano GB & Akiskal HS (1989) Lack of specificity of reduced platelet imipramine binding in different psychiatric conditions. Psychiatry Res 30: 21-29.

Marrero O (1983) The performance of several statistical tests for seasonality in monthly data. J Stat Computat Simul 17: 275-296.

Martin SJ, Kelly IW & Saklofske DH (1992) Suicide and lunar cycles: a critical review over 28 years. Psychol Rep 71: 787-795.

Martinez-Schnell B & Zaidi A (1989) Time series analysis of injuries. Stat Med 8: 1497-1508.

Marttunen M (1994) Adolescent suicide in Finland. Publications of the National Public Health Institute, KTL A2/1994. T-print Ky, Hyvinkää.

Marttunen MJ, Aro HM, Henriksson MM & Lönnqvist JK (1991) Mental disorders in adolescent suicide. DSM-III-R axes I and II diagnoses in suicides among 13- to 19-year-olds in Finland. Arch Gen Psychiatry 48: 834-839.

Massing W & Angermeyer MC (1985) The monthly and weekly distribution of suicide. Soc Sci Med 21: 433-441.

Masterton G (1991) Monthly and seasonal variation in parasuicide. A sex difference. Br J Psychiatry 158: 155-157.

Mawson D & Smith A (1981) Relative humidity and manic admissions in the London Area. Br J Psychiatry 138: 134-138.

McCleary R & Hay RA (1980) Applied time series analysis for the social sciences. Sage publications Inc, California.

McGrath JJ & Welham JL (1999) Season of birth and schizophrenia: a systematic review and meta-analysis of data from the southern hemisphere. Schizophr Res 35: 237-242.

McGuigan SM (1995) The use of statistic in the British Journal of Psychiatry. Br J Psychiatry 169: 683-688.

Meares R, Mendelsohn FA & Milgrom-Friedman J (1981) A sex difference in the seasonal variation of suicide rate: a single cycle for men, two cycles for women. Br J Psychiatry 138: 321-325.

Mersch PPA, Middendorp HM, Bouhuys AL, Beersma DGM & van der Hoofdakker RH (1999) Seasonal affective disorder and latitude: a review of the literature. J Aff Disord 53: 35-48.

Miccolo R, Williams P, Zimmerman-Tansella C & Tansella M (1991) Geographical and urban-rural variation in the seasonality of suicide: some further evidence. J Affect Disord 21: 39-43.

Miccolo R, Zimmerman-Tansella CH, Williams P & Tansella M (1988) Geographical variation in the seasonality of suicide. J Affect Disord 15: 163-168.

Miccolo R, Zimmerman-Tansella C, Williams P & Tansella M (1989) Seasonal variation in suicide: is there a sex difference? Psychol Med 19: 199-203.

Michael RP & Zumpe D (1983) Sexual violence in the United States and the role of season. Am J Psychiatry 140: 883-886.

MMWR (1996) Morbidity and mortality weekly report. 45; 460-464.

Modan B, Nissenkorn I & Lewkowski SR (1970) Suicide in a heterogeneous society. Br J Psychiatry 116: 65-68.

Modestin J (1998) Criminal and violent behavior in schizophrenic patients: an overview. Psychiatry Clin Neurosci 52: 547-554.

Modestin J, Ammann R & Würmle O (1995) Season of birth: comparison of patients with schizophrenia, affective disorders and alcoholism. Acta Psychiatr Scand 91: 140-143.

Munro BH (1997) Statistical methods for health care research. Lippincott, Philadelphia.

Myers DH & Davies P (1978) The seasonal incidence of mania and its relationship to climatic variables. Psychol Med 8: 433-440.

Nakamura JW, McLeod CR & McDermott JF (1994) Temporal variation in adolescent suicide attempts. Suicide Life Threat Behav 24(4): 343-349.

Näyhä S (1980) Short and medium-term variations in mortality in Finland. Scand J Soc Med 21: 1-101.

Näyhä S (1982) Autumn incidence of suicides re-examined: Data from Finland by sex, age and occupation. Br J Psychiatry 141: 512-517.

Näyhä S (1983) The bi-seasonal incidence of some suicides. Experience from Finland by marital status, 1961-1976. Acta Psychiatr Scand 67: 32-42.

Näyhä S (1984) Autumn and suicide in northern Finland. Arct Med Res 37: 25-29.

Näyhä S, Väisänen E & Hassi J (1994) Season and mental illness in an arctic area of northern Finland. Acta Psychiatr Scand 377: 46-49.

Nelson W, Tong YL, Lee JK & Halberg F (1979) Methods for cosinor-rhythmometry. Chronobiologia 9: 397-439.

Nieminen P (1995) Therapeutic community research and statistical data analysis. Acta Universitatis Ouluensis D 360. University of Oulu, Printing centre, Oulu.

Norusis MJ (1995) SPSS 6.1. Guide to data analysis. Prentice Hall, New Jersey.

O"Donnell I & Farmer RDT (1992) Suicidal acts on metro systems: an international perspective. Acta Psychiatr Scand 86: 60-63.

Okawa M, Shirakawa S, Uchiyama M, Oguri M, Kohsaka M, Mishima K, Sakamoto K, Inoue H, Kamei K & Takahashi K (1996) Seasonal variation of mood and behaviour in a healthy middle-aged population in Japan. Acta Psychiatr Scand 94: 211-216.

Oldehinkel AJ (1998) Monthly variation in the care-based incidence of psychopathology. Soc Psychiatry Psychiatr Epidemiol 33: 118-123.

Parker G & Neilson M (1976) Mental disorder and season of birth - a southern hemisphere study. Br J Psychiatry 129: 355-361.

Parker G & Walter S (1982) Seasonal variation in depressive disorders and suicidal deaths in New South Wales. Br J Psychiatry 40: 626-632.

Partonen T & Lönnqvist J (1996) Seasonal variation in bipolar disorder. Br J Psychiatry 169: 641-646.

Partonen T & Lönnqvist J (1998) Seasonal affective disorder. Lancet 352: 1369-1374.

Pauly JE (1980) The spectrum of rhythms. In: Sheving LE & Halberg F (eds) Chronobiology: principles and applications to shifts in schedules. Sijthoff & Noorhoff International Publishers, the Netherlands.

Phillips DP & Ruth TE (1993) Adequacy of official suicide statistics for scientific research and public policy. Suic Life Threat Behav 23: 307-319.

Phillips D & Wills JS (1987) A drop in suicides around major national holidays. Suic Life Threat Behav 17: 1-12.

Phillips DP, Christenfeld N & Ryan NM (1999) An increase in the number of deaths in the United States in the first week of the month: an association with substance abuse and other causes of death. N Engl J Med 341: 93-98.

Pickles A (1998) Psychiatric epidemiology. Stat Methods Med Res 7: 235-251.

Pine DS, Trautman PD, Shaffer D, Cohen L, Davies M, Stanley M & Parsons B (1995) Seasonal rhythm of platelet 3H-imipramine binding in adolescents who attempted suicide. Am J Psychiatry 152: 923-924.

Pio-Abreau JL (1997) Seasonal variation in bipolar disorder. Br J Psychiatry 170: 483-484.

Pirkola S (1999a) Alcohol and other substance misuse in suicide. Publications of the National Public Health Institute KTL A14/1999. Yliopistopaino, Helsinki.

Pirkola SP, Marttunen MJ, Henriksson MM, Isometsä ET, Heikkinen ME & Lönnqvist JK (1999b) Alcohol-related problems among adolescent suicides in Finland. Alcohol Alcohol 34: 320-329.

Pocock SJ (1974) Harmonic analysis applied to seasonal variations in sickness absence. App Stat 23: 103-120.

Poikolainen K (1982) Seasonality of alcohol-related hospital admissions has implications for prevention. Drug Alcohol Depend 10: 65-69.

Pokorny AD, Davis F & Harberson W (1963) Suicide, suicide attempts, and weather. Am J Psychiatry 120: 377-381.

Preti A (1997) The influence of seasonal change on suicidal behaviour in Italy. J Aff Disord 44: 123-130.

Pulver AE, Moorman CC, Brown CH, McGarth JA & Wolyniec PS (1990) Age-incidence artefacts do not account for the season-of-birth effect in schizophrenia. Schizophr Bull 16: 13-15.

Putkonen H, Collander J, Honkasalo ML & Lönnqvist J (1998) Finnish female homicide offenders 1982-92. J Forensic Psychiatry 9: 672-684.

Reid P, Smith H & Greene S (1980) Seasonal variation in Irish suicidal deaths. Psychol Rep 46(1): 306.

Reiss AJ & Roth JA (1993) Understanding and preventing violence. National research council. National Academic Press, Washington DC.

Rezaul I, Persaud R, Takei N & Treasure J (1996) Season of birth and eating disorders. Int J Eat Disord 19: 53-61.

Roger JH (1977). Significance test for cyclic trends in incidence data. Biometrika 64: 152-155.

Rogerson P (1996) A generalization of Hewitt’s test for seasonality. Int J Epidemiol 25(3): 644-648.

Rosen LN, Targum SD & Terman M (1990) Prevalence of seasonal affective disorder at four latitudes. Psychiatry Res 31: 131-44.

Rosenthal NE, Sack DA, Gillin JC, Lewy AJ, Goodwin FK, Davenport Y, Mueller PS, Newsome DA & Wehr TA (1984) Seasonal affective disorder: a description of the syndrome and preliminary findings with light therapy. Arch Gen Psychiatry 41: 72-80.

Rotton J & Frey J (1985) Air pollution, weather, and violent crimes: concomitant time-series analysis of archival data. J Pers Soc Psychol 49: 1207-1220.

Räsänen P, Hakko H & Järvelin MR (1999) Prenatal and perinatal risk factors for psychiatric diseases of early onset . Results are different if seasons are categorized differently. BMJ 318(7198): 1622-1623.

Saarijärvi S, Lauerma H, Helenius H & Saarilehto S (1999) Seasonal affective disorders among rural Finns and Lapps. Acta Psychiatr Scand 99: 95-101.

Salib E & Gray N (1997) Weather conditions and fatal self-harm in North Cheshire 1989-1993. Br J Psychiatry 170: 473-477.

Sarmukaddam S & Rao S (1987) A comparison of statistical test for seasonality. NIMHANS 5: 53-58.

Schmidtke A (1994) Suicidal behaviour on railways in the FRG. Soc Sci Med 38: 419-426.

Schreiber G, Avissar S, Tzahor Z, Barak-Glantz I & Grisaru N (1997) Photoperiodicity and annual rhythms of wars and violent crimes. Med Hypoth 48: 89-96.

Schreiber G, Dycian A, Kaplan Z & Bleich A (1993) A unique monthly distribution of suicide and parasuicide through firearms among Israeli soldiers. Acta Psychiatr Scand 87: 110-113.

Scott KWM (1994) Suicide in Wolverhampton (1976-1990). Med Sci Law 34(2): 99-105.

Shapiro CM, Blake F, Fossey E & Adams B (1990) Daylight saving time in psychiatric illness. J Aff Disord 19(3): 177-181.

Shensky T & Shur E (1982) Season of birth of schizophrenics: cyclic trends and their analysis. Br J Psychiatry 20: 316-317.

Siegel S & Castellan NJ (1988) Nonparametric statistics for the behavioral sciences. McGraw-Hill International, Singapore.

Silverstone T, Romans S, Hunt N & McPherson H (1995) Is there a seasonal pattern of relapse in bipolar affective disorders? A dual northern and southern hemisphere cohort study. Br J Psychiatry 167(1): 58-60.

Smolensky MH (1987) Chronobiology and epidemiology. Path Biol 35: 991-1004.

Smolensky MH & D’Alonzo GE (1988) Biologic rhythms and medicine. Am J Med 85(1B): 34-46.

Sokal RR & Rohlf FJ (1981) Biometry. The principles and practice of statistics in biological research. WH Freeman & Co, San Francisco.

Souetre E (1988) Completed suicides and traffic accidents: longitudinal analysis in France. Acta Psychiatr Scand 77: 530-534.

Souetre E, Salvati E, Belugou JL, Douillet P, Braccini T & Darcourt G (1987) Seasonality of suicides: environmental, sociological and biological covariations. J Affect Disord 13: 215-225.

Souetre E, Wehr TA, Douillet P & Darcourt G (1990) Influence of environmental factors on suicidal behavior. Psychiatric Res 32: 253-263.

SPSS (1994) SPSS Trends 6.1 Spss Inc, USA.

St Leger AS (1976) Comparison of two tests for seasonality in epidemiological data. J R Stat Soc (Series C) 25: 280-286.

Statistics Finland (1985) Statistical yearbook of Finland 1983. Statistics Finland, Helsinki.

Statistics Finland (1991) Statistical yearbook of Finland 1991. Statistics Finland, Helsinki.

Statistics Finland (1997) Statistical yearbook of Finland 1997. Statistics Finland, Helsinki. .

Statistics Finland (1998) Causes of death 1986-96. Health. Statistics Finland, Helsinki.

Statistics Finland (1999a) Statistical yearbook of Finland 1999. Statistics Finland, Helsinki.

Statistics Finland (1999b) Yearbook of justice statistics 1999, Tummavuoren kirjapaino Oy, Vantaa.

Suhail K & Cochrane R (1997) Seasonal changes in affective state in samples of Asian and white women. Soc Psychiatry Psychiatr Epidemiol 32: 149-157.

Suhail K & Cochrane R (1998) Seasonal variations in hospital admissions for affective disorders by gender and ethnicity. Soc Psychiatry Psychiatr Epidemiol 33: 211-217.

Symonds RL & Williams P (1976) Seasonal variation in the incidence of mania. Br J Psychiatry 129: 45-48.

Tabachnick BG & Fidell LS (1989) Using multivariate statistics, second edition. Harper Collins Publisher Inc, USA.

Takei N, O’Callaghan E, Sham P, Glover G, Tamura A & Murray R (1992) Seasonality of admissions in the psychoses: effect of diagnoses, sex, and age of onset. Br J Psychiatry 161: 506-511.

Takei N & Murray RM (1993) Gender difference of schizophrenia in seasonal admission in Scotland. Br J Psychiatry 162: 272-273.

Tango T (1984) The detection of disease clustering in time. Biometrics 40: 15-26.

Tennenbaum AN & Fink EL (1994) Temporal regularities in homicide: cycles, seasons and autoregression. J Quant Criminol 10: 317-342.

Thompson C, Raheja SK & King EA (1995) A follow-up study of Seasonal Affective Disorder. Br J Psychiatry 167: 380-384.

Thrall T & Engelman L (1990) Univariate and bivariate spectral analysis (1T). In: BMDP Statistical Software Manual, Volume 2, University of California Press, Berkeley.

Tietjen GH & Kripke DF (1994) Suicides in California (1968-1977): absence of seasonality in Los Angeles and Sacramento Counties. Psychiatry Res 53: 161-172.

Tiihonen J, Eronen M & Hakola P (1993) Criminality associated with mental disorder and intellectual deficiency. Arch Gen Psychiatry 50: 917-918.

Tiihonen J & Hakola P (1994) Psychiatric disorders and homicide recidivism. Am J Psychiatry 151: 436-438.

Tiihonen J, Hakola P, Eronen M, Vartiainen H, Ryynänen OP (1996) Risk of homicidal behavior among discharged forensic psychiatric patients. Forensic Sci Int 79: 123-129.

Torrey EF, Rawlings RR, Ennis JM, Dickerson-Merrill D & Flores DS (1996) Birth seasonality in bipolar disorder, schizophrenia, schizoaffective disorder and stillbirths. Schizophr Res 21: 141-149.

Torrey EF, Miller J, Rawlings R & Yolken RH (1997) Seasonality of births in schizophrenia and bipolar disorder: a review of the literature. Schizophr Res 28:1-38.

Traskman L, Asberg M, Bertilsson L & Sjöstrand L (1981) Monoamine metabolites in CSF and suicidal behaviour. Arch Gen Psychiatry 38: 631-636.

Van Praag HM (1984) Depression, suicide and the metabolism of serotonin in the brain. J Affect Disord 4: 275-290.

Virkkunen M, Rawlings R, Tokola R, Poland RE, Guidotti A, Nemeroff C, Bisette G, Kalogeras K, Karonen S & Linnoila M (1994) CSF biochemistries, glucose metabolism, and diurnal activity rhythms in alcoholic, violent offenders, fire setters, and healthy volunteers. Arch Gen Psychiatry 51: 20-27.

Walter S & Elwood J (1975) A test for seasonality of events with a variable population at risk. Br J Prev Soc Med 29: 18-21.

Walter SD (1977a) The power of a test for seasonality. Br J Prev Soc Med 31: 137-140.

Walter SD (1977b) Seasonality of mania: a reappraisal. Br J Psychiatry 131: 345-350.

Walter SD (1982) Study of seasonality. Am J Epidemiol 116: 192-196.

Walter SD (1994) Calendar effects in the analysis of seasonal data. Am J Epidemiol 140: 649-657.

Wasserman I & Stack S (1994) Age, birthday, and suicide. J Soc Psychol 134: 493-495.

Watson CG, Tilleskjor C, Kucala T & Jacobs L (1984) The birth seasonality effect in non-schizophrenic psychiatric patients. J Clin Psychol 40: 884-888.

Webster (1996) Webster’s encyclopaedic unabridged dictionary of the English language, new revised version, Random House Value Publishing Inc., New Jersey.

Wehr TA & Rosenthal NE (1989) Seasonality and affective illness. Am J Psychiatry 146: 829- 839.

Wehrung DA & Hay S (1970) A study of seasonal incidence of congenital malformations in the United States. Br J Prev Soc Med 24: 24-32.

White SJ (1979) Statistical errors in papers in the British Journal of Psychiatry. Br J Psychiatry 135: 336-342.

Wonnacott TH & Wonnacott RJ (1990) Introductory statistics. Fifth edition, John Wiley & Sons, Singapore.

World Health Organization (1977) Manual of the International Statistical Classification of Diseases, Injuries, and Causes of Death, 9th revision, Volume I. WHO, Geneva.

World Health Organisation (1993) The ICD-10 classification of mental and behavioural disorders: diagnostic criteria for research. WHO, Geneva.

Zung WW & Green RL (1974) Seasonal variation of suicide and depression. Arch Gen Psychiatry 30: 89-91.

Åsberg M, Träskman L & Thoren P (1976) 5-HIAA in the cerebrospinal fluid: a biochemical suicide predictor. Arch Gen Psychiatry 33: 1193-1197.

Öhberg A (1998a) Suicide methods in Finland. Publications of the National Public Health Institute NPHI A7/1998. Hakapaino Oy, Helsinki.

Öhberg A & Lönnqvist J (1998b) Suicides hidden among undetermined deaths. Acta Psychiatr Scand 98: 214-218.

Öhberg A, Lönnqvist J, Sarna S, Vuori E & Penttilä A (1995) Trends and availability of suicide methods in Finland. Proposals for restrictive measures. Br J Psychiatry 166: 35-43.

Öhberg A, Penttilä A, Lönnqvist J (1997) Driver suicides. Br J Psychiatry 171: 468-472.

Öhberg A, Vuori E, Ojanperä I &Lönnqvist J (1996) Alcohol and drugs in suicides. Br J Psychiatry 169: 75-80.