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Table 1 Baseline characteristics of 92,796 women who delivered singleton live births

From: Does overweight before pregnancy reduce the occurrence of gastroschisis?: the Japan Environment and Children’s Study

 Number of womenFrequency (%)Gastroschisis (n = 9)
Number of casesFrequency (%)
Pre-pregnancy body mass index
 < 18.5 kg/m2 (underweight)15,03416.220.01
 18.5–24.9 kg/m2 (reference)67,77473.140.01
 ≥ 25.0 kg/m2 (overweight)986410.620.02
 Missing1240.11 
Age at delivery (years)
 < 208540.900
 20–2933,95536.620.01
 30–3953,68357.970.01
 ≥ 4042994.600
 Missing50.00 
Occupation in early pregnancy
 Administrative, managerial, professional, or engineering20,98822.600
 Clerical15,50116.730.02
 Sales and service20,11821.730.01
 Homemaker25,19327.220.01
 Others89659.700
 Missing20312.21 
Smoking habits
 Never smoked53,33657.530.01
 Ex-smoker or smoker during early pregnancy38,48641.560.02
 Missing9741.10 
Alcohol consumption
 Never drank31,68134.150.02
 Ex-drinker or drinker during early pregnancy60,23164.940.01
 Missing8841.00 
Current history of diabetes or gestational diabetes
 No89,87196.990.01
 Yes29253.200
Parity
 040,42043.630.01
 ≥ 151,96856.050.01
 Missing4080.41 
Infertility treatment
 No86,53293.380.01
 Yes61406.600
 Missing1240.11 
Routine use of folic acid supplement
 No (< 4 times/week)66,17271.350.01
 Yes (≥ 4 times/week)24,54826.530.01
 Missing20762.21 
Week of pregnancy at delivery
 < 3743644.760.14
 ≥ 3788,21095.130.00
 Missing2220.20 
Infant sex
 Male47,60351.370.01
 Female45,18248.720.00
 Unknown or missing110.00