Table 1.

Sociodemographic characteristics and lifestyle habits of adults aged 23–25 years participating in the 1978/1979 Ribeirão Preto birth cohort study (São Paulo, Brazil, 2002–2004).

Variable	Total		Male		Female		p-value**
	n	%*	n	%*	n	%*
Sex	1,021	100.0	481	50.8	540	49.3	-
Age
23	315	30.5	146	29.2	169	31.8	0.688
24	503	49.0	237	49.9	266	48.0
25	203	20.5	98	20.9	105	20.2
Race/Ethnic group
White	665	61.7	311	61.8	354	61.6	0.507
Brown	293	31.3	136	30.1	157	32.5
Black	52	5.9	27	6.7	25	5.1
Yellow/Oriental	11	1.1	7	1.4	4	0.8
Family income (in MWa)
< 5	324	34.4	138	31.4	186	37.5	< 0.001
5-9.9	329	30.9	147	29.7	182	32.0
>9.9	395	26.7	168	32.3	127	21.0
No information	73	8.0	28	6.6	45	9.5
Marital status
With a partner	314	31.4	121	26.1	193	36.9	< 0.001
Without a partner	707	68.6	360	73.9	347	63.1
Smoking
No	857	82.9	392	80.6	465	85.2	0.074
Yes	164	17.1	89	19.4	75	14.8
Physical activity level
Low	498	49.2	276	57.9	222	40.3	< 0.001
Moderate	311	29.9	137	27.5	174	32.3
High	209	20.5	68	14.7	141	26.6
No information	3	0.4	0	0.0	3	0.8
Television and reading time
< 3 h	343	33.5	165	34.1	178	32.9	0.714
≥3 h	678	66.5	316	65.9	362	67.1
Anabolic steroid use
No	999	97.8	461	96.0	538	99.7	< 0.001
Yes	22	2.2	20	4.0	2	0.3

^*Relative frequencies weighted by loss to follow-up.

^**Pearson's chi-square or Fisher's exact test.

^aMW: minimum wage, which from 2002 to 2004 ranged from R$ 200,00 to 260,00.