| Variables | Univariate analysis | Multivariate analysis | ||||
| UORa | 95% CIb | p-value | AORc | 95% CI | p-value | |
| Age (years) (n = 426) | 1.01 | 0.98 - 1.03 | 0.348 |
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| Marital status (n = 428) |
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| Married or living in a couple | 1.40 | 0.59 - 3.34 | 0.441 |
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| Single or living alone | 1.00 |
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| Level of education (n = 428) |
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| None | 1.21 | 0.77 - 1.91 | 0.393 |
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| Primary or higher | 1.00 |
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| Type of driver (n = 428) |
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| Occasional | 1.00 |
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| Regular | 1.50 | 0.86 - 2.60 | 0.148 |
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| Daily income (USD) (n = 401) |
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| Less than 8.9 | 1.00 |
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| 1.00 |
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| 8.9 and more | 1.77 | 0.87 - 3.59 | 0.111 | 2.08 | 1.05 - 4.11 | 0.034 |
| Number of years of riding (n = 428) |
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| 0 - 10 | 1.00 |
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| 1.00 |
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| 11 or more | 2.13 | 1.35 - 3.35 | 0.001 | 2.01 | 1.20 - 3.38 | 0.008 |
| RC history (n =424) |
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| Yes | 2.95 | 1.88 - 4.65 | < 0.001 | 2.74 | 1.66 - 4.52 | < 0.001 |
| No | 1.00 |
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| 1.00 |
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| Alcohol daily consumption (n = 421) |
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| Yes | 2.16 | 1.37 - 3.40 | 0.001 | 2.09 | 1.27 - 3.45 | 0.004 |
| No | 1.00 |
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| 1.00 |
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| Tobacco daily consumption (n = 423) |
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| Yes | 1.21 | 0.41 - 3.58 | 0.718 |
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| No | 1.00 |
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| Tramadol daily consumption (n = 420) |
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| Yes | 1.55 | 0.97 - 2.47 | 0.063 |
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| No | 1.00 |
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