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Table 1 Characteristics of study participants

From: Estimated postnatal p,p’-DDT and p,p’-DDE levels and body mass index at 42 months of age in a longitudinal study of Japanese children

Variablen (%)Median (range)
Child characteristics
 Sex
 Male156 (54) 
 Female134 (46) 
Gestational age (weeks)290 (100)40 (36, 42)
Birth weight (kg)290 (100)3.0 (2.2, 4.2)
42 month examination
 Weight (kg)290 (100)15 (11, 20)
 Height (cm)290 (100)97 (89, 105)
 BMI290 (100)16 (13, 20)
 BMI z-score290 (100)0.5 (−2.0, 3.0)
Maternal characteristics
 Age at delivery (years)290 (100)31 (20, 41)
 Height (cm)290 (100)158 (147, 173)
 Weight (kg, pre-pregnancy)290 (100)52 (41, 81)
 BMI (pre-pregnancy)290 (100)21 (16, 34)
 Weight (kg, postpartum)216 (75)55 (42, 83)
 Weight gain during pregnancy (kg)258 (89)9.3 (−1.4, 21.0)
 Total breastfeeding duration (years)290 (100)1.4 (0.1, 4.0)
 Education290 (100) 
 Junior high school5 (2) 
 High school65 (22) 
 College127 (44) 
 University92 (32) 
 Unknown1 (0) 
 Fish intake (g/year)290 (100)21,977 (0, 112,603)