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Table 1 Distribution of selected characteristics in 1745 women, Kyushu Okinawa Maternal and Child Health Study, Japan, April 2007 to March 2008

From: Smoking and secondhand smoke exposure and prevalence of depressive symptoms during pregnancy in Japan: baseline data from the Kyushu Okinawa Maternal and Child Health Study

Variable n (%)
Age, years, mean ± SD 31.2 ± 4.4
Gestation, weeks, mean ± SD 18.5 ± 5.4
Region of residence
 Fukuoka Prefecture 970 (55.6)
 Other than Fukuoka Prefecture in Kyushu 593 (34.0)
 Okinawa Prefecture 182 (10.4)
Number of children
 0 703 (40.3)
 1 690 (39.5)
 ≥ 2 352 (20.2)
Nuclear family structure 1474 (84.5)
Family income, yen/year
 < 4,000,000 633 (36.3)
 4,000,000–5,999,999 620 (35.5)
 ≥ 6,000,000 492 (28.2)
Education, years
 < 13 430 (24.6)
 13–14 575 (33.0)
 ≥ 15 740 (42.4)
Job typea
 Unemployed 707 (40.5)
 Professional or technical 433 (24.8)
 Clerical or related occupation 328 (18.8)
 Sales 83 (4.8)
 Service 115 (6.6)
 Production 51 (2.9)
 Othersb 28 (1.6)
History of depression 84 (4.8)
Family history of depression 175 (10.0)
  1. a Full-time or part-time employment in the year when the first questionnaire was conducted or in the previous year
  2. bManagement; protection services; farming, fishing, or forestry; transportation or communications; or construction
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