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Table 1 Characteristics of the mothers and offspring in ALSPAC and BiB

From: Exploring the causal effect of maternal pregnancy adiposity on offspring adiposity: Mendelian randomisation using polygenic risk scores

  ALSPAC BiB (WE) BiB (SA)
Mean SD N Female offspring (%) Mean SD N Female offspring (%) Mean SD N Female offspring (%)
Maternal BMI (kg/m2) 23.0 3.8    26.9 6.0    25.8 5.5   
Maternal age (years) 29.3 4.5    27.4 6.0    28.8 5.0   
Birth weight (z score) 0.10 0.95 5085 50.5 − 0.05 0.97 1992 47.9 − 0.56 0.92 2262 47.9
Gestational age (weeks) 39.6 1.7    39.4 1.6    39.1 1.5   
1-year weight for length percentilea 0.64 0.27 4838 50.6 0.61 0.28 1798 47.8 0.48 0.30 2023 48.1
Age at measurement (years) 0.9 0.2    0.8 0.3    0.8 0.3   
4-year BMI (z score) 0.46 1.05 4670 50.2 0.50 0.97 1339 48.6 0.10 1.21 1566 48.5
Age at measurement (years) 4.1 0.7    4.5 0.7    4.5 0.7   
10-year BMI (z score) 0.26 1.12 4476 51.3         
Age at measurement (years) 9.9 0.5           
15-year BMI (z score) 0.30 1.11 4112 51.7         
Age at measurement (years) 15.0 0.8           
  1. SA South Asians, WE White Europeans, SD standard deviation, z score: sex- and gestational age-adjusted standard deviation score (UK-WHO Growth Reference [88]). aSex-adjusted percentile calculated using the WHO Child Growth Standards [89]. All z scores and percentiles were calculated via the zanthro Stata package [90]. Data for absolute values (as opposed to z scores) are presented in Additional file 1: Supplementary information S18