Table 2.

Crude and adjusted analysis of the effect of independent variables on occurrence of underweight. Pelotas, Southern Brazil, 1982 to 2004-5

Variable	Men				Women
	Crude		Adjusted*		Crude		Adjusted**
	PR	95% CI	PR	95% CI	PR	95% CI	PR	95% CI
Skin color		p = 0.77***		p = 0.46***		p = 0.45***		p = 0.39***
White	1	-	1	-	1	-	1	-
Black or Mixed	0.93	0.59;1.48	0.86	0.54;1.38	0.86	0.58;1.27	0.85	0.57;1.26
Family income -1982 (MW)		p = 0.06****		p = 0.04****		p = 0.92****		p = 0.89****
≤1	2.80	0.67;11.85	3.01	0.71;12.82	0.90	0.46;1.80	0.95	0.49;1.94
1.1 - 3	3.60	0.89;14.55	3.75	0.93;15.16	0.87	0.46;1.63	0.91	0.48;1.71
3.1 - 6	2.37	0.55;10.17	2.39	0.56;10.26	0.88	0.44;1.75	0.90	0.45;1.80
6.1 - 10	2.40	0.47;12.16	2.40	0.47;12.14	0.81	0.33;1.97	0.82	0.33;2.00
>10	1	-	1	-	1	-	1	-
Change in income (1982 → 2004-5)		p = 0.05***		p = 0.06***		p = 0.73****		p = 0.48****
Always poor	0.92	0.53;1.61	0.95	0.54;1.69	1.15	0.76;1.72	1.26	0.83;1.92
Non poor → poor	1.51	0.96;2.38	1.52	0.97;2.40	0.89	0.57;1.39	0.92	0.59;1.43
Poor → non poor	0.57	0.29;1.11	0.59	0.30;1.15	0.97	0.61;1.54	1.04	0.65;1.67
Never poor	1	-	1	0.53;1.89	1	-	1	-
Birthweight (grams)		p <0.001****		p <0.001****		p <0.001****		p <0.001****
<2500	6.72	1.52;29.82	6.28	1.44;27.49	3.24	1.00;10.52	3.24	1.00;10.52
2500 - 2999	5.68	1.38;23.49	5.47	1.33;22.39	2.27	0.73;7.09	2.27	0.73;7.09
3000 - 3499	4.00	0.98;16.37	3.88	0.95;15.82	1.99	0.64;6.21	1.99	0.64;6.21
3500 - 3999	2.98	0.71;12.53	2.92	0.70;12.26	0.84	0.25;2.81	0.84	0.25;2.81
≥4000	1	-	1	-	1	-	1	-
Breastfeeding (months)		p = 0.41****		p = 0.67****		p = 0.03****		p = 0.07****
<1.0	1.34	0.69;2.57	1.21	0.63;2.35	2.02	1.15;3.54	1.86	1.07;3.25
1.0 - 2.9	1.19	0.62;2.29	1.12	0.58;2.15	1.49	0.84;2.63	1.44	0.81;2.54
3.0 - 5.9	1.44	0.75;2.75	1.41	0.74;2.70	1.54	0.86;2.74	1.53	0.86;2.72
6.0 - 8.9	1.54	0.72;3.31	1.57	0.73;3.38	1.59	0.80;3.19	1.53	0.76;3.07
9.0 - 11.9	0.62	0.14;2.70	0.68	0.16;2.96	1.65	0.67;4.08	1.80	0.73;4.44
≥12.0	1	-	1	-	1	-	1	-
Youth’s schooling (years)		p = 0.30****		p = 0.93****		p = 0.55****		p = 0.77****
0 - 4	1.76	0.77;3.87	1.25	0.49;3.22	1.24	0.67;2.30	0.97	0.51;1.84
5 - 8	1.30	0.65;2.60	1.00	0.45;2.24	0.99	0.62;1.56	0.81	0.51;1.30
9 - 11	1.36	0.70;2.64	1.15	0.54;2.45	0.86	0.57;1.29	0.78	0.52;1.17
≥12	1	-	1	-	1	-	1	-

MW: Minimum wages

^*Variables in the first level (skin color, family income in 1982) adjusted for each other. Change in income adjusted for skin color. Breastfeeding and youth’s schooling adjusted for birthweight.

^**Variables in the first level (skin color, family income in 1982) adjusted for each other. Change in income adjusted for skin color. Breastfeeding adjusted for birthweight and youth’s schooling adjusted for breastfeeding and birthweight.

^***Wald’s test for heterogeneity

^****Test for linear trend