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Table 1 Comparison of maternal characteristics between women from the sample at the 3rd month follow-up and women from the 2004 cohort study.

From: Differentials and income-related inequalities in maternal depression during the first two years after childbirth: birth cohort studies from Brazil and the UK

Variable Sample
%
Rest of the cohort
%
p*
Black/mixed ethnic origin 28.0 27.0 0.540
Maternal age    0.448
   ≤ 19 19.0 18.9  
   20–34 68.9 67.3  
   >34 12.1 13.8  
Single mother 15.4 16.9 0.276
Parity    0.001
   0 43.9 38.1  
   1 26.6 25.9  
   ≥ 2 29.5 36.0  
Pre-pregnancy body mass index (kg/m2)    0.805
   <18.5 5.5 4.8  
   18.5 – 24.9 60.0 61.6  
   25.0 – 29.9 23.4 23.0  
   ≥ 30 11.1 10.6  
Antenatal risk    0.231
   Low 18.4 17.7  
   Medium 69.1 67.5  
   High 12.5 14.8  
Smoked during pregnancy 25.6 24.9 0.661
Multiple birth 2.3 1.0 0.018
Had child with neonatal problems 7.9 10.0 0.06
  1. * chi-square test