Table 4. Comparison of prevalence of four-item Patient Health Questionnaire (PHQ-4) stages in residents before and after implementing duty hour limits.
| Work schedule/ PHQ-4 Stage |
All, % | 24-hour, % | Night float, % | |||
|---|---|---|---|---|---|---|
| After, n = 158 |
Before, n = 181 |
After, n = 137 |
Before, n = 141 |
After, n = 21 |
Before, n = 40 |
|
| Normal | 29.7 | 18.8 | 32.8 | 22.0 | 38.1 | 7.5 |
| Mild | 29.1 | 39.2 | 33.6 | 40.4 | 57.1 | 35.0 |
| Moderate | 24.7 | 22.1 | 23.4 | 19.1 | 4.8 | 32.5 |
| Severe | 16.5 | 19.9 | 10.2 | 18.4 | 0.0 | 25.0 |
| χ2 | 7.53 | 7.72 | 18.89, Fisher’s exact test | |||
| p-value | 0.057 | 0.052 | < 0.001 | |||