Characteristics of 9799 pregnant public hospital employees* in Denmark, 2007–2013
| N | % | Mean | SD | |
| Age, years | 30.9 | 3.9 | ||
| Body mass index, kg/m2 | 23.8 | 4.5 | ||
| Parity | ||||
| 1 | 5095 | 52.0 | ||
| 2 | 3061 | 31.2 | ||
| ≥3 | 1527 | 15.6 | ||
| Smoking | ||||
| Non-smoker | 9067 | 92.6 | ||
| Former smoker | 191 | 2.0 | ||
| Smoker | 265 | 2.7 | ||
| Socioeconomic status | ||||
| Low | 670 | 6.9 | ||
| Medium | 6973 | 71.4 | ||
| High | 2118 | 21.7 | ||
| Most frequent occupations | ||||
| Nurse | 6334 | 64.6 | ||
| Physician | 1593 | 16.3 | ||
| Nurse assistant | 572 | 5.8 | ||
| Laboratory technician | 259 | 2.6 | ||
| Midwife | 207 | 2.1 | ||
| Care worker | 138 | 1.4 | ||
| Number of day shifts† | ||||
| All women | 60.7 | 25.4 | ||
| Nurses | 57.5 | 22.1 | ||
| Physicians | 80.5 | 24.3 | ||
| Number of night shifts† | ||||
| All women— total number of night shifts | 14.1 | 12.1 | ||
| Nurses | ||||
| Night shifts of ≤8 hours | 7.8 | 7.9 | ||
| Night shifts of >8–12 hours | 6.6 | 7.6 | ||
| Night shifts of >12 hours | 3.9 | 3.6 | ||
| Physicians | ||||
| Night shifts of ≤8 hours | 1.1 | 0.3 | ||
| Night shifts of >8–12 hours | 1.4 | 1.9 | ||
| Night shifts of >12 hours | 8.0 | 4.6 | ||
| Weekly working hours—paid and unpaid leave excluded† | ||||
| All women | 23.6 | 6.7 | ||
| Nurses | 22.9 | 6.2 | ||
| Physicians | 28.5 | 6.5 | ||
| Days of absence—sick leave and pregnancy leave included† | ||||
| All women | 31.6 | 38.7 | ||
| Nurses | 34.4 | 38.9 | ||
| Physicians | 15.7 | 25.9 |
*Workers with ≥1 day shift and ≥1 night shift and ≥1 day of sick leave during the first 32 pregnancy weeks.
†During the first 32 pregnancy weeks.