Table 3.

Prevalence of obesity (BMI≥30 kg/m²) according to demographic and socioeconomic variables, birthweight, and breastfeeding. Pelotas, Southern Brazil, 1982 to 2004-5

Variable	Total		Men		Women
Variable	n	%	n	%	n	%
Skin color		p = 0.18^*		p = 0.17^*		p = 0.001^*
White	3170	7.7	1653	7.6	1517	7.8
Black or Mixed	882	9.1	469	5.8	413	12.8
Family income -1982 (MW)		p = 0.19^**		p = 0.03^**		p = 0.001^**
≤1	826	7.9	438	5.9	388	10.1
1.1 - 3	2079	8.8	1092	7.1	987	10.7
3.1 - 6	788	8.4	415	9.4	373	7.2
6.1 - 10	244	5.3	128	7.0	116	3.4
>10	240	6.3	123	11.4	117	0.9
Change in income (1982 → 2004-5)		p = 0.04^**		p = 0.02^**		p <0.001^**
Always poor	682	10.3	334	4.8	348	15.5
Non poor → poor	697	8.6	340	7.9	357	9.2
Poor → non poor	649	7.1	360	5.6	289	9.0
Never poor	2170	7.7	1172	8.8	998	6.4
Birthweight (grams)		p = 0.006^**		p = 0.002^**		p = 0.31^**
<2500	295	3.4	135	0.7	160	5.6
2500 - 2999	994	8.0	450	6.4	544	9.4
3000 - 3499	1588	8.5	846	8.0	742	9.0
3500 - 3999	1081	8.2	610	8.0	471	8.5
≥4000	239	12.1	165	11.5	74	13.5
Breastfeeding (months)		p = 0.11^**		p = 0.05^*		p = 0.10^**
<1.0	885	8.4	482	8.7	403	7.9
1.0 - 2.9	1049	6.7	542	6.5	507	6.9
3.0 - 5.9	934	8.1	484	5.8	450	10.7
6.0 - 8.9	380	9.5	201	12.4	179	6.1
9.0 - 11.9	157	10.2	83	7.2	74	13.5
≥12.0	661	9.4	335	8.4	326	10.4
Youth’s schooling (years)		p = 0.003^**		p = 0.32^*		p <0.001^**
0 - 4	337	10.4	206	7.3	131	15.3
5 - 8	1172	9.7	716	8.2	456	12.1
9 - 11	2028	7.4	1010	6.5	1018	8.3
≥12	661	6.7	274	9.5	387	4.7

Total	4198	8.2	2206	7.5	1992^***	8.9

MW: Minimum wages

Chi-square test for heterogeneity

^**

Chi-square test for linear trend

^***

Excluding 90 women with 3 or more months of pregnancy