Number of births among mothers and fathers at different levels of exposure in selected categories of demographic data in Norway 1967–95
| Mother's exposure | Father's exposure | |||||
|---|---|---|---|---|---|---|
| <4 h | 4–24 h | >24 h | <4 h | 4–24 h | >24 h | |
| Total births (n) | 772790 | 58265 | 5420 | 1128986 | 114000 | 47312 |
| Education (y, %): | ||||||
| <10 | 13.2 | 22.1 | 38.0 | 19.0 | 24.3 | 29.6 |
| 10–12 | 52.0 | 54.7 | 52.8 | 50.8 | 61.8 | 59.6 |
| >12 | 34.3 | 22.8 | 8.4 | 29.7 | 13.3 | 10.3 |
| No education | 0.005 | 0 | 0 | 0.01 | 0.02 | 0.04 |
| Unknown | 0.4 | 0.5 | 0.8 | 0.4 | 0.6 | 0.6 |
| Place of birth (%): | ||||||
| Oslo or Akershus | 21.8 | 24.9 | 6.6 | 20.3 | 14.5 | 7.7 |
| Hordaland | 9.9 | 11.6 | 17.2 | 10.5 | 11.9 | 12.6 |
| Sør-Trøndelag | 6.4 | 4.7 | 3.8 | 6.1 | 5.1 | 5.0 |
| Others | 61.9 | 58.9 | 72.4 | 63.1 | 68.5 | 74.7 |
| Age of mother (%): | ||||||
| ≤20 | 5.2 | 8.4 | 12.2 | 6.5 | 8.8 | 9.9 |
| 21–25 | 28.8 | 37.2 | 41.1 | 31.1 | 36.6 | 36.1 |
| 26–30 | 36.4 | 35.0 | 29.0 | 35.4 | 33.1 | 31.7 |
| 31–35 | 21.5 | 15.0 | 12.8 | 19.2 | 15.4 | 15.7 |
| >35 | 8.0 | 4.4 | 5.0 | 7.9 | 6.0 | 6.6 |
| Year of birth (%): | ||||||
| 1967–75 | 28.5 | 40.8 | 42.0 | 39.0 | 40.8 | 43.8 |
| 1976–85 | 35.5 | 36.4 | 31.4 | 33.2 | 31.1 | 31.3 |
| 1986–95 | 36.0 | 22.8 | 26.6 | 27.8 | 28.1 | 24.9 |