Table 2. Prevalence, mean total score, standard deviation (SD) and effect sizes of insomnia, sleepiness, fatigue, anxiety, depression and shift work disorder across three groups of nurses working different numbers of quick returns.
| Number of quick returns | 0 (N = 290) | 1–30 (N = 724) | >30 (N = 892) | Effect sizes (Cohen's d) | ||
| 1–30 vs 0 | >30 vs 0 | >30 vs 1–30 | ||||
| Insomnia | 45.0% | 53.5% | 57.8% | 0.17 | 0.26 | 0.08 |
| BIS total score (SD) | 13.2 (9.9) | 13.3 (8.1) | 13.8 (7.9) | 0.02 | 0.07 | 0.06 |
| Excessive Sleepiness | 18.8% | 28.1% | 30.9% | 0.20 | 0.25 | 0.06 |
| ESS total score (SD) | 7.2 (3.5) | 8.4 (3.7) | 8.9 (3.6) | 0.33 | 0.47 | 0.14 |
| Excessive fatigue | 35.5% | 37.2% | 43.4% | 0.02 | 0.14 | 0.12 |
| Fatigue total score (SD) | 13.5 (4.5) | 13.3 (4.1) | 13.9 (4.4) | −0.05 | 0.09 | 0.14 |
| Anxiety | 19.2% | 18.0% | 20.7% | −0.04 | 0.01 | 0.07 |
| HAD-A total score (SD) | 4.5 (3.6) | 4.6 (3.3) | 4.8 (3.6) | 0.03 | 0.08 | 0.06 |
| Depression | 8.4% | 8.4% | 9.0% | 0.00 | 0.02 | 0.02 |
| HAD-D total score (SD) | 2.8 (3.1) | 2.7 (2.9) | 2.8 (2.9) | −0.03 | 0.00 | 0.03 |
| SWD | 24.5% | 35.4% | 45.1% | 0.24 | 0.43 | 0.20 |
N = Number.
SD = Standard deviation.
BIS = Bergen Insomnia Scale.
ESS = Epworth sleepiness Scale.
HAD-A = Hospital anxiety and depression scale- Anxiety.
HAD-D = Hospital anxiety and depression scale- Depression.
SWD = Shift work disorder.