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Table 1 Comparison of the baseline characteristics of the IDEFICS and reference populations

From: Assessment of selection bias in a health survey of children and families – the IDEFICS Sweden-study

  IDEFICS population Reference population p-value
N=1 825 N=1 825
Gender Male 937 (51.3%) 937 (51.3%)  
  Female 888 (48.7%) 888 (48.7%) 1.000
Age (years)   6.16 (2.04) 6.16 (2.04) 0.985
Place of residence Partille 914 (50.1%) 914 (50.1%)  
  Alingsås 333 (18.2%) 338 (18.5%)  
  Mölndal 578 (31.7%) 573 (31.4%)  
Children’s characteristics at birth Birth weight (kg)a 3.53 (0.57) 3.53 (0.57) 0.693
n = 1 742 n = 1 598
  Birth length (cm)a 50.5 (2.4) 50.5 (2.4) 0.612
n = 1 726 n = 1 586
  Ponderal index (kg/m3)a 27.3 (2.6) 27.3 (2.7) 0.757
n = 1 726 n = 1 586
  Large for gestational age (LGA)b 50 (3.8%) 40 (2.7%) 0.113
n = 1 316 n = 1 481
  Small for gestational age (SGA)b 27 (2.1%) 33 (2.2%) 0.884
n = 1 286 n = 1 500
  1. The matching between groups and children's characteristics at birth is shown. Data are presented as number and percent (%) or the mean with standard deviation (SD).
  2. a Children’s birth weights and lengths are derived from; register data, and the anthropometric data from Child Health Centres and School Health Services.
  3. b LGA, SGA variables were derived from register data.