Risk of calling in sick, regardless of duration of sick leave, within 24 hours after night versus day shifts during the first 32 pregnancy weeks with the participants as their own controls* among 9799 public hospital employees† in Denmark, 2007–2013
| Risk days (n) | OR | 95% CI | |
| First pregnancy trimester | |||
| All women | 197 851 | 1.28 | 1.19 to 1.37 |
| Nurses (n=6334) | 124 091 | 1.14 | 1.05 to 1.24 |
| Physicians (n=1593) | 40 252 | 1.94 | 1.67 to 2.27 |
| Second pregnancy trimester | |||
| All women | 182 838 | 1.27 | 1.17 to 1.39 |
| Nurses | 111 665 | 1.02 | 0.91 to 1.15 |
| Physicians | 40 496 | 1.89 | 1.59 to 2.26 |
| Third pregnancy trimester | |||
| All women | 93 649 | 1.13 | 0.96 to 1.33 |
| Nurses | 53 257 | 1.01 | 0.81 to 1.25 |
| Physicians | 24 965 | 1.49 | 1.09 to 2.04 |
*Fixed effects logistic regression analysis.
†Workers with ≥1 day shift and ≥1 night shift and ≥1 day of sick leave during the first 32 pregnancy weeks.