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 2 Stunting prevalence per cohort and family income quintile, at 1, 2 and 4 years

Cohort study	Stunting prevalence,%, per quintile					SII (95% CI)	RII (95% CI)
	Poorest	2^nd	3^rd	4^th	Richest
*1 year*
1982	19.8	10.6	6.0	5.5	3.6	−16.80 (−21.80; -11.82)	0.10 (0.04; 0.21)
1993	16.8	11.5	6.9	5.4	4.8	−18.52 (−24.84; -12.19)	0.19 (0.11; 0.34)
2004	8.1	9.1	5.7	3.8	3.1	−7.60 (−10.23; -4.98)	0.25 (0.15; 0.40)
x ² test for linear trend	p < 0.001	p = 0.350	p = 0.752	p = 0.178	p = 0.525	p < 0.001*	p = 0.125*
*2 years*
1982	28.9	21.8	10.1	7.1	3.6	−32.04 (−35.34; -28.74)	0.05 (0.04; 0.07)
2004	8.8	8.4	3.8	2.4	1.5	−10.34 (−12.74; -7.93)	0.09 (0.05; 0.17)
x ² test for heterogeneity	p < 0.001	p < 0.001	p < 0.001	p < 0.001	p = 0.007	p < 0.001*	p = 0.205*
*4 years*
1982	26.0	16.0	6.3	5.3	2.7	−27.79 (−30.83; -24.75)	0.04 (0.03; 0.06)
1993	11.8	4.6	5.5	2.3	2.6	−14.24 (−19.34; -9.15)	0.11 (0.05; 0.25)
2004	6.7	5.3	3.1	2.0	1.1	−7.21 (−9.30; -5.11)	0.11 (0.06; 0.21)
x ² test for linear trend	p < 0.001	p < 0.001	p = 0.002	p < 0.001	p = 0.028	p < 0.001*	p = 0.085*

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.

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