Table 1. Demographics, work organization, use of prescribed medications, and sleep characteristics of drivers providing a blood sample (N=115).
| Mean±SD | n (%) | Mean±SD | n (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Age | 47.8±9.7 | Prescribed Medication | |||||||
| Race | Yes | 77(67.0) | |||||||
| White/Caucasian | 75 (65.2) | Blood Pressure | 27 (23.7) | ||||||
| Black/AA | 28 (24.4) | Cardiovascular | 15 (13.2) | ||||||
| Hispanic | 9 (7.8) | Cholesterol | 8 (7.0) | ||||||
| Other | 3 (2.6) | Diabetes | 6 (5.3) | ||||||
| Driving Experience | 14.4±11.3 | No | 38 (33.0) | ||||||
| Compensation | Sleep Duration (Workdays) | ||||||||
| By the mile | 80 (69.6) | Less than 7 hrs | 55 (47.8) | ||||||
| By the load | 15 (13.0) | 7 to 9 hrs | 53 (46.1) | ||||||
| % of revenue | 18 (15.7) | More than 9 hrs | 7 (6.1) | ||||||
| Other | 2 (1.7) | Sleep Duration (Non-Workdays) | 6.86±1.48 | ||||||
| Driving Miles per Week | 2,740.8±792.1 | Less than 7 hrs | 27 (23.5) | ||||||
| Less than 2,500 | 35 (30.4) | 7 to 9 hrs | 57 (49.6) | ||||||
| 2,500–3,000 | 58 (50.5) | More than 9 hrs | 31 (27.0 | ||||||
| More than 3,000 | 22 (19.1) | Sleep Quality (Workdays) | 7.95±1.99 | ||||||
| Daily Work Hours | Poor | 41 (35.7) | |||||||
| 11 or less | 34 (29.6) | Good | 74 (64.3) | ||||||
| More than 11 | 81 (70.4) | Sleep Quality (Non-Workdays) | |||||||
| Poor | 15 (14.9) | ||||||||
| Good | 86 (85.1) | ||||||||