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Demographic characteristics of Norwegian nurses included in the study.
| Sex (n = 1,787): female | 90.0% |
| Age in years; mean and SD (n = 1,784) | 36.5 (8.6) |
| Married/cohabiting (n = 1,762) | 74.2% |
| Children living at home (n = 1,744): yes | 54.5% |
| Smoking (n = 1,778): yes | 8.9% |
| Cups of caffeine daily; mean and SD (n = 1,784) | 3.5 (2.5) |
| Body mass index; mean and SD (n = 1,771) | 25.1 (4.5) |
