Time to conception according to specific characteristics of the women, pregnancies and cycles
| Characteristic | Laboratory department | Non-laboratory department | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Pregnancies/ cycles (n) | Cycles to conception (mean) | Pregnant in first cycle (%) | >12 Cycles to pregnancy (%) | Pregnancies/ cycles (n) | Cycles to conception (mean) | Pregnant in first cycle (%) | >12 Cycles to pregnancy (%) | ||
| Pregnancy No: | |||||||||
| 1 | 152/612 | 5.4 | 38.8 | 8.6 | 116/481 | 6.0 | 32.8 | 8.6 | |
| 2 | 142/415 | 3.0 | 40.8 | 1.4 | 113/361 | 3.4 | 37.2 | 3.5 | |
| ⩾3 | 117/336 | 3.5 | 44.4 | 4.3 | 95/314 | 3.8 | 41.1 | 4.2 | |
| Mother's age: | |||||||||
| <29 | 108/282 | 2.8 | 47.2 | 0.9 | 97/280 | 3.0 | 43.3 | 3.1 | |
| 30–34 | 219/705 | 4.1 | 42.5 | 5.0 | 138/509 | 4.5 | 36.2 | 5.1 | |
| ⩾35 | 84/376 | 5.7 | 29.8 | 9.5 | 89/367 | 6.0 | 30.3 | 9.0 | |
| Father's age: | |||||||||
| <29 | 102/278 | 3.5 | 41.2 | 2.0 | 80/240 | 3.1 | 42.5 | 3.8 | |
| 30–34 | 168/491 | 3.4 | 48.2 | 4.8 | 111/392 | 5.1 | 33.3 | 6.3 | |
| Father's work: | |||||||||
| Non-laboratory | 284/997 | 4.4 | 40.8 | 5.3 | 303/1084 | 4.4 | 36.3 | 5.6 | |
| Laboratory | 122/358 | 3.3 | 41.8 | 4.1 | 16/45 | 2.8 | 50.0 | 0.0 | |
| Duration of employment (y): | |||||||||
| 1–5 | 26/67 | 2.7 | 57.7 | 3.8 | 113/384 | 4.1 | 44.2 | 6.2 | |
| ⩾15 | 90/427 | 6.3 | 24.4 | 12.2 | 45/235 | 9.5 | 11.1 | 13.3 | |
| Known fertility problems: | |||||||||
| No | 375/1110 | 3.1 | 42.9 | 2.4 | 288/979 | 3.8 | 37.2 | 3.5 | |
| Yes | 30/237 | 16.8 | 13.3 | 36.7 | 27/155 | 12.3 | 33.3 | 29.6 | |
| Smoking cigarettes/day: | |||||||||
| None | 348/1150 | 4.0 | 41.4 | 4.6 | 253/885 | 4.2 | 38.3 | 5.1 | |
| 1–9 | 24/89 | 6.0 | 33.3 | 12.5 | 22/74 | 3.7 | 36.4 | 4.5 | |
| 10–19 | 20/50 | 2.3 | 50.0 | 0.0 | 19/106 | 11.4 | 15.8 | 21.1 | |
| ⩾20 | 15/50 | 4.3 | 40.0 | 6.7 | 22/37 | 2.1 | 45.5 | 0.0 | |
Uncensored data are shown for female laboratory and non-laboratory personnel who worked ⩾1 year at the participating Swedish universities and gave at least one birth during the period 1990–4. The number of women was 560 and the total number of pregnancies 735 (laboratory 411, non-laboratory 324). Fewer pregnancies for a specific characteristic are due to missing values for that particular characteristic.