Table 1.
Participant characteristics for intensive care doctors and nurses (n = 50) and summary of the consecutive night shifts worked by participants involved in the alertness and performance testing.
| Doctors (n = 11) | Nurses(n = 39) | Participants(n = 50) | ||||
|---|---|---|---|---|---|---|
| Demographics | n | Mean ± SD | Range | Doctors vs Nurses (p-value) | ||
| Sex (female) | 5 | 31 | 0.03 | |||
| Age (years ± SD) | 32.7 ± 5.4 | 34.1 ± 10.6 | 33.8 ± 9.7 | 22–64 | 0.68 | |
| BMI (kg/m2 ± SD) | 27.7 ± 8.1 | 24.6 ± 4.2 | 25.3 ± 5.4 | 16–44 | 0.09 | |
| Night shift experience (years ± SD)) | 7.1 ± 5.9 | 10.1 ± 7.7 | 9.5 ± 7.4 | 0–30 | 0.23 | |
| Caffeine consumption (Cups ± SD)) (Work Day) | 1.1 ± 0.5 | 1.3 ± 0.7 | 50 | 1.3 ± 0.7 | 0–3 | 0.34 |
| Caffeine consumption (Cups ± SD)) (Non-work Day) | 0.9 ± 0.3 | 1.1 ± 0.6 | 50 | 1.1 ± 0.5 | 0–2 | 0.31 |
| Sleep-health measures | ||||||
| Insomnia Severity Index ± SD | 6.3 ± 3.2 | 8.9 ± 5.6 | 50 | 8.3 ± 5.2 | 0–20 | 0.14 |
| Epworth Sleepiness Scale ± SD | 7.6 ± 4.6 | 6.4 ± 3.6 | 50 | 6.7 ± 3.8 | 0–15 | 0.36 |
| <11 | 7 | 33 | 40 | |||
| ≥11 | 4 | 6 | 10 | |||
| Morningness-Eveningness Questionnaire | 32.4 ± 8.6 | 39.0 ± 6.4 | 37.5 ± 7.4 | 20–52 | 0.01 | |
| Definite evening type (16–30) | 4 | 4 | 8 | |||
| Definite morning type (70–86) | 0 | 0 | 0 | |||
| Pittsburgh Sleep Quality Index | 6.0 ± 2.4 | 6.6 ± 2.8 | 6.5 ± 2.7 | 2–16 | 0.49 | |
| <5 | 4 | 6 | 10 | |||
| ≥5 | 7 | 33 | 40 | |||
| Alertness and performance testing (Number of consecutive nights worked) | ||||||
| 3 night shifts | - | 15 | ||||
| 4 night shifts | 8 | 9 | ||||
| 5 night shifts | 1 | 2 | ||||