| Q9c | Tramadol | 1. Never | ☐ |
| 2. Once or twice | ☐ | ||
| 3. Weekly (1-2 times a week) | ☐ | ||
| 4. Monthly | ☐ | ||
| 5. Daily or almost daily (>3 times a week) | ☐ | ||
| Q10 | Have you ever been in a road crash before being a motorcycle taxi driver?*
| 1. Yes | ☐ |
| 0. No | ☐ | ||
| Q11 | Have you ever been involved in a road crash after working as a motorcycle taxi driver?* | 1. Yes | ☐ |
| 0. No | ☐ |