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Table 1 Comparison between adolescents who were followed-up at 18-y with the original cohort and the sub-sample at 6 and 12-months according to sociodemographic and anthropometric variables. 1993 Pelotas Birth Cohort

From: Breastfeeding and complementary feeding associated with body composition in 18–19 years old adolescents in the 1993 Pelotas Birth Cohort

Variable N original cohort Cohort members followed in 2011–2012 Sub-sample cohort members (n = 1438) followed at 6 and 12 months and located in 2011–2012
% lost to follow-upa p b % lost to follow-upc p d
All sample 5248 21.8   21.0  
Sex
 Men 2603 22.6 0.149 20.4 0.627
 Women 2645 20.9   21.6  
Maternal age (years)
  < 20 915 23.3 0.420 27.3 0.068
 20–34 3756 21.6   19.7  
  > 35 577 20.6   21.2  
Maternal skin colour e
 White 4058 22.2 0.313 21.9 0.246
 Black 955 20.1   18.8  
 Others 234 20.5   14.2  
Family income at birth (quintiles) e
 1° 1031 24.4 0.06 24.5 0.502
 2° 1195 21.1   21.1  
 3° 889 21.0   19.5  
 4° 1001 18.9   17.9  
 5° 1021 21.9   20.3  
Maternal education (years) e
 0–4 1427 25.5 <0.001 23.4 0.572
 5–8 2424 19.1   19.8  
 9–11 923 20.8   19.9  
  > =12 427 26.2   22.9  
Birth weight (grams) e
  < 2500 510 27.6 0.001 21.2 0.285
  ≥ 2500 4722 21.0   18.7  
  1. aNumber of lost to follow-up in 2012 as a percentage of those evaluated in the original cohort. bChi-squared test of the comparison between the cohort members followed-up in 2012 and the original cohort. cNumber of lost to follow-up in 2012 at 6 and 12 months with complete data at 2011–2012 follow-up as a percentage of those evaluated in the sub-sample at 6 and 12 months. dChi-squared test of the comparison between the cohort members with complete information for analyses at 18 years in relation with the sub-sample followed-up at 6 and 12 months. eVariables with missing data (maximum valor of missing information is 2% for family income)