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Table 2 Comparison of children’s anthropometric measurements in the IDEFICS and reference populations

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

Child anthropometric measurements IDEFICS population Reference population p-value
(n=1 825) (n=1 825)  
BMI SDS index at age of inclusiona 0.110 (1.000) 0.169 (0.976) 0.160
0.085 (−3.548; 4.010) 0.126 (−3.432; 3.671)
n = 1 644 n = 1 479
BMI SDS at 2.5 yearsb 0.135 (0.997) 0.163 (0.984) 0.469
n = 1 389 n = 1 265
BMI SDS at 4 yearsb 0.063 (0.987) 0.067 (0.986) 0.978
n = 1 622 n = 1 471
BMI SDS at 5.5 yearsb 0.080 (1.016) 0.075 (1.009) 0.521
n = 1 450 n = 1 333
BMI SDS at 8 yearsb 0.191 (1.025) 0.303 (1.040) 0.049
n = 1 060 n = 1 002
BMI categories at 2.5 years    
Normal weight and underweight 1 227 (88.4%) 1 096 (86.6%)  
Overweight 136 (9.8%) 147 (11.6%)  
Obese 25 (1.8%) 22 (1.7%) 0.281
BMI categories at 4 years    
Normal weight and underweight 1 443 (89.0%) 1 302 (88.6%)  
Overweight 153 (9.4%) 138 (9.4%)  
Obese 26 (1.6%) 30 (2.0%) 0.577
BMI categories at 5.5 years    
Normal weight and underweight 1 272 (87.7%) 1 150 (86.3%)  
Overweight 142 (9.8%) 144 (10.8%)  
Obese 36 (2.5%) 39 (2.9%) 0.253
BMI categories at 8 years    
Normal weight and underweight 883 (83.2%) 802 (80.0%)  
Overweight 147 (13.9%) 155 (15.5%)  
Obese 31 (2.9%) 45 (4.5%) 0.033
  1. Data are presented as means with standard deviation (SD), median (min; max), or number and percent (%).
  2. a BMI SDS index: Body mass index standard deviation score index.
  3. b BMI SDS: Body mass index standard deviation score.