Table 1. Demographic characteristics in this study.

	Male		Female		P-value
	n	Mean (s.d.)	n	Mean (s.d.)
BMI, kg m−2
15 years	1881	19.6 (2.4)	1700	20.6 (3.0)	<0.001
20 years	1829	22.6 (2.5)	1735	21.8 (2.9)	<0.001
26 years	1822	23.4 (2.8)	1782	22.4 (3.2)	<0.001
36 years	1632	24.8 (3.2)	1648	23.6 (4.1)	<0.001
43 years	1617	25.7 (3.5)	1608	25.2 (4.8)	<0.001
53 years	1452	27.4 (4.0)	1496	27.4 (5.5)	0.81
60–64 years	1061	27.9 (4.1)	1158	27.9 (5.5)	0.92
Adolescents behavioral problemsa
Self-control	2044	−0.13 (1.01)	1883	0.14 (0.97)	<0.001
Conduct problem	2044	0.11 (0.98)	1883	−0.12 (1.01)	<0.001
Emotional problem	2044	−0.09 (0.96)	1883	0.10 (1.03)	<0.001
Birth weight, g	2798	3444 (558)	2529	3302 (513)	<0.001
Weight at age 2 years, kg	2530	13.2 (1.4)	2303	12.6 (1.4)	<0.001
Cognition at age 8 yearsa	2282	−0.03 (0.88)	2102	0.02 (0.85)	0.070
Childhood social class					0.80
I or II	638		559
III	1193		1090
IV or V	621		572
Educational attainment					<0.001
None	930		835
Vocational only	141		212
O level	343		520
A level	590		450
Higher	304		107
Occupational social class at age 53 years					<0.001
I or II	1015		674
III	857		937
IV or V	272		445

Abbreviation: BMI, body mass index.

^aZ-scores.