Calculated ‘aetiological fraction (AF)’ for certain exposures in the high exposure case group and in the whole case group
| Type of exposure | Degree of exposure | Number of cases | RR | AF in high exposure cases (%) | AF in all cases (%) | |
| Jumps | Low | 190 | 1.0 | |||
| High | 24 | 2.1 | 51 | 5 | ||
| Number of stairs | Low | 44 | 1.0 | |||
| High | 80 | 2.1 | 52 | 18 | ||
| Heavy lifting | Low | 47 | 1.0 | |||
| High | 82 | 1.5 | 28 | 10 | ||
| Physically demanding tasks | Low | 125 | 1.0 | |||
| High | 81 | 2.3 | 56 | 20 | ||