| Professional motorcycle drivers | Non-professional motorcycle drivers | X2 | P-value |
Mean age | 51.63 ± 5.85 | 49.00 ± 6.92 | 15.49 | 0.560 |
Primary | 33.33% | 33.33% | 0.024 | 0.988 |
Secondary | 26.67% | 30.30% | ||
Not in school | 40% | 36.67% |