Person-years | Cases | Crude HR | Adjusted HR* | |
No night work | 107 203 | 216 | 1 | 1 |
Night work ever | 52 997 | 83 | 0.77 (0.59–0.99) | 0.96 (0.74–1.23) |
No night work | 107 203 | 216 | 1 | 1 |
1–3 years night work | 36 472 | 57 | 0.78 (0.58–1.04) | 1.08 (0.80–1.44) |
4–7 years night work | 15 707 | 21 | 0.63 (0.39–0.97) | 0.65 (0.40–1.00) |
8+ years night work | 818 | 5 | 3.43 (1.18–7.95) | 2.80 (0.96–6.52) |
No night work | 107 203 | 216 | 1 | 1 |
Risk per year of night work | 52 997 | 83 | 0.96 (0.89–1.03) | 0.98 (0.92–1.05) |
No night work | 107 203 | 216 | 1 | 1 |
Night work ever† | 52 997 | 83 | 0.64 (0.40–0.98) | 1.04 (0.66–1.62) |
Risk per year of night work | 1.07 (0.95–1.20) | 0.97 (0.86–1.09) | ||
No night work | 107 203 | 216 | 1 | 1 |
Risk per 100 nights | 52 997 | 83 | 1.00 (0.92–1.07) | 0.98 (0.91–1.05) |
No night work | 107 203 | 216 | 1 | 1 |
Night work ever† | 52 997 | 83 | 0.69 (0.50–0.93) | 1.01 (0.72–1.39) |
Risk per 100 nights | 1.06 (0.97–1.15) | 0.98 (0.89–1.06) |
*Adjusted for the time-dependent variables age and childbirth (up to the year of observation, yes/no) and the fixed variables profession and country of birth. Adjustment for year of follow-up is inherent in the analytical model.
†Adjustment for night work ever was made to disentangle the effect of working night as such and the quantity of night work, see the Methods section.