Time to pregnancy and adjusted fecundity odds ratios (ORs) for occupational exposures
| 0–2 months | 3–5 months | 6–12 months | >12 months | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| n | % | n | % | n | % | n | % | OR | 95% CI | |
| Discrete time survival analysis technique performed by logistic regression; adjusted for age at conception, gravidity, prepregnancy BMI, smoking, and alcohol consumption, as well as a variable to indicate time interval and a couple’s occupational characteristics in the table except for number of night shifts per month; percentages may not add to 100.0 because of rounding. | ||||||||||
| *Only fixed night workers and rotating shift (with night) workers were included in the model, adjusted for age at conception, gravidity, prepregnancy BMI, smoking, and alcohol consumption, as well as a variable to indicate time interval and a couple’s occupational characteristics in the table. | ||||||||||
| Work schedule | ||||||||||
| Daytime work | 8700 | 49.6 | 4076 | 23.3 | 2958 | 16.9 | 1797 | 10.3 | 1 | |
| Fixed evening work | 219 | 44.4 | 113 | 22.9 | 96 | 19.5 | 65 | 13.2 | 0.80 | 0.70 to 0.92 |
| Fixed night work | 75 | 42.4 | 42 | 23.7 | 31 | 17.5 | 29 | 16.4 | 0.80 | 0.63 to 1.00 |
| Rotating shift work (without night) | 786 | 50.0 | 358 | 22.8 | 268 | 17.0 | 160 | 10.2 | 0.99 | 0.91 to 1.07 |
| Rotating shift work (with night) | 855 | 51.4 | 393 | 23.6 | 285 | 17.1 | 132 | 7.9 | 1.05 | 0.97 to 1.14 |
| Occupation, mother | ||||||||||
| Managers and professionals | 2344 | 53.7 | 1007 | 23.1 | 624 | 14.3 | 390 | 8.9 | 1.09 | 1.02 to 1.16 |
| Technicians | 3581 | 50.8 | 1656 | 23.5 | 1178 | 16.7 | 635 | 9.0 | 1 | |
| Service and sales workers | 4071 | 47.4 | 2009 | 23.4 | 1550 | 18.0 | 958 | 11.2 | 0.87 | 0.82 to 0.91 |
| Industrial workers | 639 | 44.5 | 310 | 21.6 | 286 | 19.9 | 200 | 13.9 | 0.79 | 0.72 to 0.86 |
| Occupation, father | ||||||||||
| Managers and professionals | 3316 | 52.4 | 1452 | 23.0 | 989 | 15.6 | 566 | 9.0 | 1.05 | 0.99 to 1.12 |
| Technicians | 2019 | 50.2 | 946 | 23.5 | 663 | 16.5 | 393 | 9.8 | 1 | |
| Service and sales workers | 1348 | 49.0 | 635 | 23.1 | 491 | 17.9 | 276 | 10.0 | 0.98 | 0.91 to 1.06 |
| Industrial workers | 3135 | 46.7 | 1560 | 23.2 | 1224 | 18.2 | 792 | 11.8 | 0.90 | 0.85 to 0.96 |
| No job | 528 | 51.7 | 242 | 23.7 | 171 | 16.7 | 80 | 7.8 | 1.10 | 0.99 to 1.23 |
| Working hour | ||||||||||
| 35+ | 7769 | 49.0 | 3718 | 23.4 | 2713 | 17.1 | 1658 | 10.5 | 1 | |
| <35 | 2841 | 51.4 | 1254 | 22.7 | 918 | 16.6 | 517 | 9.3 | 1.08 | 1.02 to 1.13 |
| Number of night shifts per month* | ||||||||||
| 1–8 | 805 | 51.4 | 370 | 23.6 | 271 | 17.3 | 120 | 7.7 | 1 | |
| 9+ | 114 | 43.7 | 64 | 24.5 | 44 | 16.9 | 39 | 14.9 | 0.97 | 0.70 to 1.34 |