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Table 1 Distribution of selected characteristics in 1565 mother-child pairs

From: Alcohol consumption during pregnancy and birth outcomes: the Kyushu Okinawa Maternal and Child Health Study

Variable n(%)
Baseline characteristics  
  Maternal age, years, mean ± SD 31.3 ± 4.2
  Region of residence  
   Fukuoka Prefecture 883 (56.4)
   Prefecture on Kyushu Island other than Fukuoka 527 (33.7)
   Okinawa Prefecture 155 (9.9)
  Number of living children already born to same mother  
   0 615 (39.3)
   1 633 (40.5)
   ≥ 2 317 (20.3)
  Nuclear family structure 1336 (85.4)
  Maternal education, years  
   < 13 361 (23.1)
   13 - 14 523 (33.4)
   ≥ 15 681 (43.5)
  Maternal employmenta 943 (60.3)
  Body mass index, kg/m2, mean ± SD 21.4 ± 2.7
Characteristics in the second survey  
  Maternal smoking during pregnancy  
   None 1427 (91.2)
   First trimester only 71 (4.5)
   Second and/or third trimesters but not throughout 28 (1.8)
   Throughout 39 (2.5)
  Birth weight, g, mean ± SD 3006.3 ± 395.5
  Gestational age, weeks, mean ± SD 38.9 ± 1.5
  Male gender 762 (48.7)
  Low birth weight (< 2500 g) 120 (7.7)
  Preterm birth (< 37 weeks) 62 (4.0)
  Small-for-gestational-age (< 10th percentile) 122 (7.8)
  1. aFull-time or part-time employment in the year when the first questionnaire was conducted or in the previous year.