Table 3.
Rate ratio for mortality among employees in Denmark 2000–2014 (protocol-based sensitivity analyses)
| Population | Night-time work | Persons | Person years | Cases | Rate ratio | 95% CI |
|---|---|---|---|---|---|---|
| All workers | Regular | 9798 | 84,669 | 257 | 1.11 | 0.97–1.26 |
| Occasional | 10,279 | 74,914 | 207 | 1.04 | 0.90–1.20 | |
| None | 139,856 | 1,078,416 | 2910 | 1.00 | – | |
| Workers interviewed more than once, with stable night-work status | Yes | 8078 | 55,274 | 166 | 1.14 | 0.97–1.34 |
| No | 96,708 | 627,228 | 1611 | 1.00 | – | |
| Workers interviewed in 1999–2000 | Yes | 3700 | 51,754 | 183 | 1.06 | 0.91–1.25 |
| No | 22,416 | 316,067 | 1063 | 1.00 | – | |
| Workers interviewed in 2001–2006 | Yes | 6327 | 65,024 | 196 | 1.17 | 1.00–1.36 |
| No | 40,671 | 419,397 | 1098 | 1.00 | – | |
| Workers interviewed in 2007–2013 | Yes | 10,050 | 42,805 | 85 | 0.93 | 0.74–1.17 |
| No | 76,769 | 342,952 | 749 | 1.00 | – |
The analyses were adjusted for calendar time, time passed since the start of follow-up, age, weekly working hours, sex and socio-economic status
CI confidence interval