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Table 1 Distribution of selected characteristics in 1745 pregnant women, Kyushu Okinawa Maternal and Child Health Study, Japan
| Variable | n | % |
|---|---|---|
| Region of residence | ||
| Fukuoka Prefecture | 970 | 55.6 |
| Other than Fukuoka Prefecture in Kyushu | 593 | 34.0 |
| Okinawa Prefecture | 182 | 10.4 |
| Pack-years of smoking | ||
| None | 1182 | 67.7 |
| 0.05-3.9 | 263 | 15.1 |
| ≥ 4.0 | 300 | 17.2 |
| Ever secondhand smoke exposure at home | 1315 | 75.4 |
| Ever secondhand smoke exposure at work | 1105 | 63.3 |
| Family history of asthma | 330 | 18.9 |
| Family history of atopic eczema | 302 | 17.3 |
| Family history of allergic rhinitis | 759 | 43.5 |
| Household income (yen/year) | ||
| < 4,000,000 | 632 | 36.2 |
| 4,000,000-5,999,999 | 620 | 35.5 |
| ≥ 6,000,000 | 493 | 28.3 |
| Education (years) | ||
| < 13 | 429 | 24.6 |
| 13-14 | 576 | 33.0 |
| ≥ 15 | 740 | 42.4 |
| Total no. siblings | ||
| 0 | 94 | 5.4 |
| 1 | 788 | 45.2 |
| 2 | 688 | 39.4 |
| ≥ 3 | 175 | 10.3 |
| No. older siblings | ||
| 0 | 829 | 47.5 |
| 1 | 622 | 35.6 |
| ≥ 2 | 294 | 16.9 |
| No. younger siblings | ||
| 0 | 695 | 39.8 |
| 1 | 695 | 39.8 |
| ≥ 2 | 355 | 20.3 |
