Table 1 Distribution of selected characteristics in 1745 pregnant women, Kyushu Okinawa Maternal and Child Health Study, Japan
Variable | n (%) |
|---|---|
Age, years, mean ± SD | 31.2 ± 4.3 |
Gestation, weeks, mean ± SD | 18.5 ± 5.4 |
Region of residence | Â |
   Fukuoka Prefecture | 971 (55.6) |
   Other than Fukuoka Prefecture in Kyushu | 592 (33.9) |
   Okinawa Prefecture | 182 (10.4) |
Having one or more older siblings | 914 (52.4) |
Having one or more children | 1042 (59.7) |
Having ever smoked | 563 (32.3) |
Ever experiencing secondhand smoke exposure at home | 1315 (75.4) |
Ever experiencing secondhand smoke exposure at work | 1106 (63.4) |
Family history of asthma | 330 (18.9) |
Family history of atopic eczema | 303 (17.4) |
Family history of allergic rhinitis | 759 (43.5) |
Household income, yen/year | Â |
   < 4,000,000 | 632 (36.2) |
   4,000,000-5,999,999 | 618 (35.4) |
   ≥ 6,000,000 | 495 (28.4) |
Education, years | Â |
   < 13 | 428 (24.5) |
   13-14 | 577 (33.1) |
   ≥ 15 | 740 (42.4) |
Body mass index, kg/m2, mean ± SD | 21.4 ± 2.8 |