Table 3. Multivariate analysis of predictive factors of motorcycle riding behavior.
| Variables | Behavior score | |||
|---|---|---|---|---|
| Regression Coefficient | Standard Beta | P-value | ||
| Model I: | ||||
| ADHD Index (Subscale D) as the main predictor of motorcycle riding behavior | ||||
| subscale D, ADHD | 1.09 | .28 | .001 | |
| Average hours of riding per day | ||||
| 2-4 hours | 9.8 | .18 | .008 | |
| 4-6 hours | 14.4 | .16 | .008 | |
| 6-8 hours | 15.9 | .16 | .007 | |
| More than 8 hours | -12.6 | -.03 | .520 | |
| Motorcycle riding record | ||||
| Less than 6 months | 11.20 | .15 | .004 | |
| 6-12 months | 10.34 | .14 | .003 | |
| More than 12 months | 12.3 | .17 | .002 | |
| Age | -.20 | .08- | .08 | |
| Model II: | ||||
| Attention Deficit Index (Subscale A) as the main predictor of motorcycle riding behavior | ||||
| subscale A, ADHD | 1.34 | .26 | .001 | |
| Average hours of riding per day | ||||
| 2-4 hours | 10.12 | .19 | 006 | |
| 4-6 hours | .16 | .18 | .003 | |
| 6-8 hours | 15.9 | .16 | .007 | |
| More than 8 hours | -14.44 | -.036 | .46 | |
| Motorcycle riding record | ||||
| Less than 6 months | 12.38 | 17 | 001 | |
| 6-12 months | 11.27 | .16 | .001 | |
| More than 12 months | 14.32 | .13 | .004 | |
| Age | -.24 | -.10 | .03 | |
| Model III: | ||||
| Hyperactivity-Impulsivity Index (Subscale B) as the main predictor of motorcycle riding behavior | ||||
| Subscale B, ADHD | 1.75 | .33 | .001 | |
| Average riding hours per day | ||||
| 2-4 hours | 10.34 | .19 | .004 | |
| 4-6 hours | 15.40 | .18 | .004 | |
| 6-8 hours | 18.65 | .18 | .001 | |
| More than 8 hours | -8.02 | -.02 | .67 | |
| Motorcycle riding record | ||||
| Less than 6 months | 11.95 | .16 | .002 | |
| 6-12 months | 11.48 | .16 | .001 | |
| More than 12 months | 15.2 | .14 | .003 | |
| Age | .15 | -.06 | .18 | |