Physical activity from adolescence to adulthood and health-related fitness at age 31: Cross-sectional and longitudinal analyses of the Northern Finland birth cohort of 1966
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Appendix E. 5

Table E-1. Distibution (%) of certain variables at 14 years in different study samples.

	Samples who participated in different parts of the study
	Postal inquiry at 14 years	Postal inquiry at 14 years but not at 31 years	Postal inquiry at 31 years	Medical examination^a at 31 years
	N = 11010	N = 2652	N = 8643	N = 5958
Frequency of participation in sports at 14 years	N = 10712	N = 2574	N = 8138	N = 5620
daily	18	18	17	18
every other day	20	21	20	20
twice a week	22	20	22	23
once a week	16	15	16	17
less than once a week	25	26	24	24
Body mass index at 14 years, males	N = 5066	N = 1421	N = 3644	N = 2517
underweight, < 15th percentile	15	15	15	14
normal weight, 15th-85th percentile	70	68	70	71
overweight, 85th-95th percentile	10	10	10	10
obese, > 95th percentile	6	7	5	5
Body mass index at 14 years, females	N = 5046	N = 987	N = 4060	N = 2783
underweight, < 15th percentile	15	14	15	15
normal weight, 15th-85th percentile	70	72	70	70
overweight, 85th-95th percentile	10	10	10	10
obese, > 95th percentile	5	4	5	5
Social class of the family at 14 years	N = 10913	N = 2654	N = 8254	N = 5958
I and II skilled professionals	29	27	30	29
III skilled workers	35	37	35	35
IV unskilled workers	24	27	22	22
farmers	12	8	13	15
Grade average at school at 14 years	N = 9952	N = 2161	N = 7791	N = 5515
≥ 9.0 (high)	7	5	7	6
8.0–8.9	33	28	34	33
7.0–7.9	37	37	37	38
≤ 6.9 (low)	24	30	22	22
^aall those whose body weight and height were measured in medical examination at 31 years

Table E-2. Distibution (%) of certain variables at 31 years in different study samples.

	Samples who participated in different parts of the study
	Postal inquiry at 31 years	Postal inquiry but no medical examination at 31 years	Medical examinationat 31 years	Maximal exercise test at 31 years
	N = 8643	N = 2685	N = 5958	N = 123
Frequency of brisk PA at 31 years	N = 8513	N = 2630	N = 5883	N = 120
4 times a week or more	13	14	13	23
2-3 times a week	30	31	29	29
once a week	23	22	24	21
2-3 times a month	14	13	14	8
once a month or less	21	20	21	20
Vocational education	N = 8489	N = 2617	N = 5958	N = 120
university	11	15	10	15
high education	34	32	34	40
medium education	48	45	48	38
no vocational education	7	8	7	8
Work situation at 31 years	N = 8497	N = 2616	N = 5881	N = 121
employed	61	62	60	72
entrepreneurs	8	6	9	5
full-time students	4	5	4	-
unemployed	13	12	14	19
on chilcare or maternity leave	9	10	8	2
others (e.g. long-term sick leave, housewife)	6	6	6	3
Self-reported body mass index at 31 years, kg/m2	N = 8358	N = 2603	N = 5755	N = 117
underweight, < 18.5	9	9	9	10
normal weight, 18.5-24.9	54	55	54	55
overweight, 25.0-29.9	29	28	29	31
obese, ≥ 30.0	8	9	8	4
Measured body mass index at 31 years, kg/m2	-	-	N = 5958	N = 122
underweight, < 18.5	-	-	9	7
normal weight, 18.5-24.9	-	-	52	56
overweight, 25.0-29.9	-	-	31	35
obese, ≥ 30.0	-	-	9	2
^aall those whose body weight and height were measured in medical examination at 31 years

Table E-3. Table 3. Mean value standard deviation of certain variables measured at 31 years in different study samples.

	Samples who participated in different parts of the study
	Postal inquiry at 31 years,	Medical examination at 31 years	Maximal exercise test at 31 years
	N = 8643	N = 5958	N = 123
Self-reported body mass index, kg/m2	24.4 ± 4.0 (N = 8368)	24.4 ± 3.9 (N = 5761)	24.0 ± 3.6 (N = 117)
Measured body mass index, kg/m2	–	24.7 ± 4.2 (N = 5958)	24.1 ± 3.4 (N = 122)
Heart rate after step test, beats/min	–	148 ± 17 (N = 5487)	142 ±17 (N = 119)
^aall those whose body weight and height were measured in medical examination at 31 years