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

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

Cohort study Stunting prevalence,%, per quintile SII (95% CI) RII (95% CI)
  Poorest 2nd 3rd 4th 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*
  1. CI = confidence interval; SII = slope index of inequality; RII = relative index of inequality.
  2. * x 2 test for heterogeneity to assess whether the coefficients of SII and RII are different across the three cohort studies.