Trends in socioeconomic inequalities in anthropometric status in a population undergoing the nutritional transition: data from 1982, 1993 and 2004 pelotas birth cohort studies

Table 3 Overweight prevalence, per cohort and family income quintile, at 1, 2 and 4 years

Cohort study	Overweight prevalence,%, per quintile					SII (95% CI)	RII (95% CI)
	Poorest	2^nd	3^rd	4^th	Richest
*1 year*
1982	5.0	7.9	4.4	7.8	9.2	3.93 (−0.69; 8.55)	1.85 (0.90; 3.80)
1993	12.9	9.9	8.0	14.4	9.1	−0.14 (−5.66; 5.38)	0.98 (0.52; 1.87)
2004	9.2	8.1	9.5	9.5	8.4	−0.12 (−3.29; 3.05)	0.99 (0.67; 1.46)
x ² test for linear trend	p = 0.222	p = 0.862	p = 0.006	p = 0.763	p = 0.636	p = 0.335*	p = 0.525*
*2 years*
1982	7.2	6.2	8.5	9.9	10.5	5.05 (2.31; 7.80)	1.93 (1.35; 2.76)
2004	7.5	8.2	7.0	8.9	10.0	2.86 (−0.22; 5.94)	1.46 (0.97; 2.18)
x ² test for heterogeneity	p = 0.800	p = 0.106	p = 0.224	p = 0.488	p = 0.767	p = 0.298*	p = 0.321*
*4 years*
1982	5.3	6.4	5.4	9.8	10.8	7.18 (4.52; 9.84)	2.84 (1.92; 4.20)
1993	6.0	10.1	8.7	13.5	16.0	12.69 (6.83; 18.54)	4.36 (2.18; 8.73)
2004	8.7	10.3	12.6	14.9	15.2	8.80 (5.09; 12.51)	2.27 (1.61; 3.22)
x ² test for linear trend	p = 0.007	p = 0.003	p < 0.001	p = 0.001	p = 0.006	p = 0.233*	p = 0.390*

CI = confidence interval; SII = slope index of inequality; RII = relative index of inequality.
* x ² test for heterogeneity to assess whether the coefficients of SII and RII are different across the three cohort studies.

ISSN: 1471-2458