Table 1.

Mean and standard deviation for BMI (kg/m²) in the different follow-ups of the 1982 birth cohort study, according to sex. Pelotas, southern Brazil, 1982 to 2004–2005

		Males			Females
Follow-up	Age (years)	n	Mean	sd	n	Mean	sd	P
1983	1	714	17·8	1·6	743	17·2	1·5	<0·001
1984	2	2524	17·1	1·4	2406	16·8	1·4	<0·001
1986	4	2426	16·4	1·5	2313	16·2	1·5	<0·001
1997	15	559	20·8	3·6	513	21·5	3·6	0·002
2000	18	2228	22·3	3·7
2001	19				450*	22·4	4·9
2004–2005	23	2206	23·8	4·1	1992*	23·4	4·7	0·009

*Women pregnant at the time of the interview were excluded.