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Table 1 Characteristics of the Study Population (PELAGIE Cohort, France, 2002–2013, N = 715)

From: Occupational exposure to organic solvents during pregnancy and childhood behavior: findings from the PELAGIE birth cohort (France, 2002–2013)

  N Mean ± SD or n (%)
Maternal age (years) 715 30.8 ± 4.0
Maternal education level 714  
 < 12 years   84 (11.7)
 12 years   114 (16.0)
 > 12 years   516 (71.3)
Maternal prepregnancy body mass index 715  
 ≤ 25 kg/m2   604 (84.5)
 > 25 kg/m2   111 (15.5)
Maternal tobacco consumption (early pregnancy) 710  
 None   547 (77.0)
 < 10 cig/day   118 (16.6)
 ≥ 10 cig/day   45 (6.3)
Maternal occupational exposure to solvents 715  
 No   356 (49.8)
 Occasional   139 (19.4)
 Regular   220 (30.8)
Parity 715  
 Nulliparous   299 (41.8)
 Parous   416 (58.2)
Sex 715  
 Boys   379 (53.0)
 Girls   336 (47.0)
Breastfeeding 715  
 None   232 (32.4)
 < 6 weeks   331 (45.3)
 ≥ 6 weeks   152 (21.3)
Mother-child interaction at age 2a 695 19.8 ± 3.5
  1. aScore varying between 5 and 25 (higher is better). For details, see Additional file 1: Table S2