Table 4. Association between increase in night shift and burnout dimensions, by change in overtime groups.
| Change in overtime | Increase in night shifts | Adjusted mean b | βc (95% CI) | Interaction test p-value a | |
|---|---|---|---|---|---|
| Emotional exhaustion | |||||
| Stable low overtime | No night shifts or not increased | 26.27 | Reference | 0.030 | |
| Increase in night shifts | 20.83 | -5.43 (-8.83– -2.04) | |||
| Stable high overtime | No night shifts or not increased | 27.35 | Reference | ||
| Increase in night shifts | 30.73 | 3.38 (-2.57–9.33) | |||
| Onset of high overtime | No night shifts or not increased | 28.41 | Reference | ||
| Increase in night shifts | 27.24 | -1.67 (-4.54–2.20) | |||
| Depersonalization | |||||
| Stable low overtime | No night shifts or not increased | 11.35 | Reference | 0.049 | |
| Increase in night shifts | 10.34 | -1.01 (-3.12–1.11) | |||
| Stable high overtime | No night shifts or not increased | 11.11 | Reference | ||
| Increase in night shifts | 15.45 | 4.34 (0.62–8.07) | |||
| Onset of high overtime | No night shifts or not increased | 12.53 | Reference | ||
| Increase in night shifts | 12.63 | 0.10 (-2.01–2.20) | |||
| Poor personal accomplishment | |||||
| Stable low overtime | No night shifts or not increased | 15.58 | Reference | 0.046 | |
| Increase in night shifts | 14.84 | -0.74 (-3.5–2.02) | |||
| Stable high overtime | No night shifts or not increased | 16.08 | Reference | ||
| Increase in night shifts | 21.72 | 5.65 (0.87–10.43) | |||
| Onset of high overtime | No night shifts or not increased | 18.85 | Reference | ||
| Increase in night shifts | 17.85 | -0.99 (-3.70–1.71) | |||
a Wald chi-square tests (2 degrees of freedom). b Mean level from the regression model at marginal means of the covariates. c Mean difference compared to the reference category, from linear regression models including age, sex, having worked in a COVID-19 ward, both exposure variables and their interactions, and the levels of the corresponding burnout dimension in 2019.