Participant characteristics
| Characteristic | Data |
| N | 3140 |
| Age, mean (SD) years | 38.48 (8.31) |
| Gender, n (%) | |
| Male | 2609 (83.3) |
| Female | 523 (16.7) |
| Not known | 8 (0.3) |
| Body mass index, n (%) | |
| <25 kg/m2 | 610 (19.4) |
| ≥25 and<30 kg/m2 | 1460 (46.5) |
| ≥30 and<35 kg/m2 | 781 (24.9) |
| ≥35 kg/m2 | 271 (8.6) |
| Not known | 18 (0.6) |
| Race, n (%) | |
| White | 2681 (85.4) |
| Black | 257 (8.2) |
| Asian | 34 (1.1) |
| Native American | 21 (0.7) |
| Pacific Islander | 1 (0.03) |
| Other | 100 (3.2) |
| Not known | 46 (1.5) |
| Ethnicity, n (%) | |
| Hispanic | 162 (5.2) |
| Other | 2806 (89.4) |
| Not known | 172 (5.5) |
| Overtime hours per month, mean (SD) | |
| Mandatory | 8.23 (14.01) |
| Voluntary | 12.97 (19.76) |
| Total | 19.46 (23.18) |
| Night shift frequency, n (%) | |
| Never or nearly never | 1290 (41.1) |
| 1–4 per week | 612 (19.5) |
| 1–4 per month | 584 (18.6) |
| Nearly every day | 615 (19.6) |
| Not known | 39 (1.2) |
| Long work shifts per week (≥11 hours), n (%) | |
| None | 390 (12.4) |
| >0 -<2 | 1029 (32.8) |
| ≥2 -<4 | 496 (15.8) |
| ≥4 | 482 (15.4) |
| Not known | 743 (23.7) |
| Work hours per week, n (%) | |
| <48 hours | 1820 (58.0) |
| ≥48 hours | 1260 (40.1) |
| Not known | 60 (1.9) |
| Usual shift schedule, n (%) | |
| Fixed | 1822 (58.0) |
| Irregular | 274 (8.7) |
| Rotating | 782 (24.9) |
| Other | 239 (7.6) |
| Not known | 23 (0.7) |
| Average sleep duration over the last 4 weeks*, n (%) | |
| <6 hours | 956 (30.4) |
| ≥6 hours | 1780 (56.7) |
| Not known | 404 (12.9) |
| Daytime sleepiness, n (%) | |
| Normal (<11 ESS) daytime sleepiness | 2195 (69.9) |
| Excessive (≥11 ESS) daytime sleepiness | 809 (25.8) |
| Not known | 136 (4.3) |
| Burnout, n† (%) | |
| High EE | 747 (23.8) |
| High DP | 1338 (42.6) |
| Low PA | 1278 (40.7) |
| Overall burnout‡ | 556 (17.7) |
| Police officers that had at least 1 dimension of burnout, n (%) | |
| No | 1072 (34.1) |
| Yes | 2068 (65.9) |
*Per 24-hour period.
†The burnout characteristics are not mutually exclusive (eg, a participant could have both high EE and low PA).
‡Defined as high EE, high DP, with or without low PA.
DP, depersonalisation; EE, emotional exhaustion; ESS, Epworth Sleepiness Scale; PA, personal accomplishment.