TABLE 1.
Characteristics of the study sample overall and by sleep disorder status.
| Did Not Screen Positive n=246 | Screened Positive n=170 | Overall n=416 | p-value | |
|---|---|---|---|---|
| Age (median, IQR) | 33.2 (27.4–46.3) | 38 (29.6–50.7) | 35.5 (28.3–48.6) | 0.01 |
| Missing | 5 (2.0%) | 8 (4.7%) | 9 (2.2%) | |
| Sex | ||||
| Female | 216 (87.8%) | 149 (87.7%) | 365 (87.7%) | |
| Male | 27 (11.0%) | 21 (12.4%) | 48 (11.5%) | 0.70 |
| Missing | 3 (1.2%) | 0 (0.0%) | 3 (0.7%) | |
| BMI (median, IQR) | 25.1 (22.6–28.4) | 27.4 (23.0–33.1) | 25.7 (22.7–30.0) | 0.01 |
| Missing | 8 (3.3%) | 8 (4.7%) | 16 (3.9%) | |
| Depression or anxiety | 32 (13.0%) | 58 (34.1%) | 90 (21.6%) | <0.001 |
| Depression | 9 (3.7%) | 38 (22.4%) | 47 (11.3%) | <0.001 |
| Anxiety | 29 (11.8%) | 43 (25.3%) | 72 (17.3%) | <0.001 |
| Full-time employee | 201 (81.7%) | 135 (79.4%) | 336 (80.8%) | 0.56 |
| Occupational Group | ||||
| Attending Physician | 8 (3.3%) | 2 (1.2%) | 10 (2.4%) | |
| Resident Physician or Fellow | 20 (8.1%) | 7 (4.1%) | 27 (6.5%) | |
| Nurse | 175 (71.1%) | 120 (70.6%) | 295 (70.9%) | 0.17 |
| Allied Health Professional | 31 (12.6%) | 29 (17.1%) | 60 (14.4%) | |
| Other | 12 (4.9%) | 12 (7.1%) | 24 (5.8%) | |
| Weekly hours of work (median, IQR) | 36.6 (30.0–43.5) | 36.0 (27.0–41.5) | 36.0 (30.0–42.9) | 0.21 |
| Nightly hours of sleep (median, IQR) | 7.1 (6.4–7.8) | 6.8 (6.1–7.2) | 7.0 (6.3–7.6) | <0.001 |
| Shifts per Week >12 hours | ||||
| <1.5 | 208 (84.6%) | 142 (83.5%) | 350 (84.1%) | 0.78 |
| ≥1.5 | 38 (15.5%) | 28 (16.5%) | 66 (15.9%) | |
| Frequency of overnight shifts in the past month | ||||
| Nearly every day | 102 (41.5%) | 63 (37.3%) | 165 (39.8%) | |
| 2–4 times per week | 40 (16.3%) | 26 (15.4%) | 66 (15.9%) | |
| 3–4 times per month | 34 (13.8%) | 21 (12.4%) | 55 (13.3%) | 0.65 |
| 1–2 times per month | 59 (24.0%) | 47 (27.8%) | 106 (25.5%) | |
| Never or nearly never | 11 (4.5%) | 12 (7.1%) | 23 (5.5%) | |
| Drives to work | 210 (85.4%) | 149 (87.7%) | 359 (86.3%) | 0.51 |
| Hospital | ||||
| A | 46 (18.7%) | 27 (15.9%) | 73 (17.6%) | |
| B | 79 (32.1%) | 65 (38.2%) | 144 (34.6%) | 0.50 |
| C | 42 (17.1%) | 23 (13.5%) | 65 (15.6%) | |
| D | 79 (32.1%) | 55 (32.4%) | 134 (32.2%) | |
| Months of participation (median, IQR) | 3 (2–5) | 3 (2–5) | 3 (2–5) | 0.14 |
| Safety outcomes per year | 2.30 | 4.13 | 3.08 | 0.001 |
| Motor vehicle crashes | 0.18 | 0.23 | 0.20 | 0.62 |
| Near-miss MVC | 1.12 | 2.61 | 1.76 | <0.001 |
| Occupational exposures | 0.60 | 0.55 | 0.58 | 0.68 |
| Medical errors | 0.40 | 0.74 | 0.54 | 0.22 |