Extrinsic factors reported by participants
| Category/factor | Number of citations |
| Derby culture | |
| Tough image | 2 |
| External pressure | 6 |
| Training | |
| Knowing basic derby skills | 2 |
| Injury identification | 3 |
| Lack of team cross-training | 1 |
| Competitor-related factors | |
| Unmatched skill level | 9 |
| Equipment | |
| Poor quality | 7 |
| Wrong size | 3 |
| Maintenance | 1 |
| Aspects of the sport | |
| Getting hit/hitting people | 1 |
| On four wheels | 2 |
| Quick movements | 3 |
| Facility | |
| Track surface | 5 |
| Temperature | 3 |
| Other | |
| Freak accident | 1 |