Table 1. Demographic characteristics of 34597 drivers without ADHD symptoms versus 1543 drivers with ADHD symptoms.
| Characteristics | Drivers without ADHD symptoms N = 34597 (95.7%) | Drivers with ADHD symptoms N = 1543 (4.3%) | Statistics (Khi2 or t-test) P value |
|---|---|---|---|
| Socio-demographical characteristics | |||
| Age (years) % | |||
| 18–30 | 3.8% | 10.2% | |
| 31–50 | 30.7% | 50.4% | |
| 51–65 | 40.4% | 29.9% | |
| >65 | 25.1% | 9.5% | <0.001 |
| Female (%) | 29.3% | 32.5% | 0.006 |
| Marital status (%) | |||
| Married | 80.6% | 76% | |
| Single | 7.2% | 12.7% | |
| Separated or divorced | 12.2% | 11.3% | <0.001 |
| Socio-professional categories (%) | |||
| Current employees | 59.5% | 80.4% | |
| Retired | 37.5% | 15.6% | |
| Not working | 3.0% | 4.0% | <0.001 |
| Work (%) | |||
| Diurnal work | 93.4% | 95.3% | |
| Nocturnal work | 1.0% | 1.7% | |
| Shift work | 3.7% | 4.9% | 0.002 |
| Clinical characteristics | |||
| Epworth (Mean, SD) | 7.6 (3.9) | 10.9 (4.1) | <0.001 |
| Epworth ≥ 16 | 3.2% | 14.2% | <0.001 |
| Alcohol consumption > 3 glasses per day | 6.9% | 6.8% | 0.91 |
| Drug consumption | 1.6% | 3.6% | <0.001 |
| Mean HADS anxiety | 5.0 (2.9) | 8.9 (3.7) | <0.001 |
| Pathological anxiety | 5.1% | 30.8% | <0.001 |
| Mean HADS depression | 3.1 (2.5) | 5.7 (3.4) | <0.001 |
| Pathological depression | 1.4% | 9.7% | <0.001 |
| Sleep disorder | 12.9% | 25.8% | <0.001 |
| OSAS | 3.9% | 6.9% | <0.001 |
| Restless leg syndrome | 1% | 2.9% | <0.001 |
| Insomnia | 8.8% | 18.9% | <0.001 |
| Narcolepsy-hypersomnia | 0.1% | 0.9% | <0.001 |
| Driving characteristics | |||
| License (years) | |||
| Young drivers (<2 years holding license) | 3.1% | 2.5% | 0.076 |
| Kilometers driven per year | |||
| 0–5000 | 5.3% | 5.8% | |
| 5000–25000 | 61.7% | 56.2% | |
| >25000 | 33% | 38% | <0.001 |
| Professional driver | 17.7% | 19.7% | 0.043 |
| Severe sleepiness at wheel needing driver to stop | |||
| Never | 47.1% | 23.2% | |
| Less than once a month | 45.6% | 56.3% | |
| At least once a month | 7.3% | 20.5% | <0.001 |
| Distraction at wheel | |||
| Phone | 39.2% | 59.8% | <0.001 |
| Text message | 11.4% | 28.5% | <0.001 |
| GPS | 40.1% | 61.2% | <0.001 |