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Table 1 Characteristics of the first-time mothers and infants included in the study

From: Prenatal exposure to polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) may influence birth weight among infants in a Swedish cohort with background exposure: a cross-sectional study

Characteristic N (%) Mean (Range)
Age (years) 413   28.8 (17–41)
Sampling year 413   
   1996-1999 203 (49%)  
   2000-2003 58 (14%)  
   2004-2006 62 (15%)  
   2008-2010 90 (22%)  
Pre-pregnancy BMI (body mass index, kg/m2) 412   23.4 (15.9-39.7)
Weight gain during pregnancy (%) 411   23 ((−6)-54)
Years of education 389   
   ≤ 4 years of high school 138 (35%)  
   1–3 years of higher education 76 (20%)  
   >3 years of higher education 175 (45%)  
Smoking habits during pregnancy 411   
   Smoker 53 (13%)  
   Non-smoker 302 (73%)  
   Former smoker 56 (14%)  
Consumption of fish (g/day) 374   29 (0–134)
Gestational length (days) 295   281 (249–302)
Birth weight of the child (g) 411   3589 (2430–5110)
Sex of the child 411   
   Male 218 (53%)  
   Female 193 (47%)