Standardised incidence ratio (SIR) and relative HR (RHR) (adjusted for BMI and sport classification) of THA in female and male former athletes
| Female athletes | Male athletes | |||||
| SIR* (95% CI) | RHR (95% CI) | P value | SIR* (95% CI) | RHR (95% CI) | P value | |
| Impact | ||||||
| Low | 1.38 (0.52 to 2.23) | 1 | Ref | 1.42 (0.79 to 2.03) | 1 | Ref |
| Intermediate | 1.84 (0.80 to 2.89) | 1.18 (0.38 to 3.59) | 0.776 | 2.06 (0.98 to 3.14) | 1.41 (0.71 to 2.83) | 0.329 |
| High | 2.04 (1.36 to 2.73) | 1.46 (0.59 to 3.61) | 0.417 | 2.96 (2.21 to 3.70) | 1.81 (1.06 to 3.08) | 0.029 |
| Unclassified | 2.05 (1.28 to 2.82) | 1.35 (0.55 to 3.35) | 0.512 | 2.27 (1.34 to 3.20) | 1.18 (0.58 to 2.41) | 0.655 |
| BMI at 20 years | ||||||
| ≤20 kg/m2 | 1.18 (0.62 to 1.74) | 1 | Ref | 2.22 (0.68 to 3.76) | 1 | Ref |
| >20 and ≤25 kg/m2 | 1.88 (1.20 to 2.57) | 2.63 (1.44 to 4.86) | 0.002 | 1.76 (1.12 to 2.40) | 0.77 (0.38 to 1.54) | 0.459 |
| >25 kg/m2 | 2.64 (1.65 to 3.64) | 6.76 (2.12 to 21.56) | 0.001 | 2.71 (2.07 to 3.36) | 0.79 (0.33 to 1.87) | 0.592 |
The athletes are categorised by high, intermediate, low or unclassified joint impact sport participation.
*SIR at 75 years of age.
BMI, body mass index; THA, total hip arthroplasty.