| Full model | Parsimonious model (after variable selection) | Final model after adjustment (shrinkage) for overfitting | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Candidate prognostic factors | β†| 95% CI | OR | 95% CI | p value | β†| 95% CI | OR | 95% CI | p value | Adjusted β†| Adjusted OR |
Anthropometrics | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
Age at PHE (years) | 0.095 | 0.032 to 0.159 | 1.100 | 1.032 to 1.172 | 0.003 | 0.091 | 0.034 to 0.148 | 1.095 | 1.035 to 1.159 | 0.002 | 0.065* | 1.068 |
BMI (kg/m2) | − 0.078 | − 0.249 to 0.093 | 0.925 | 0.780 to 1.098 | 0.372 |  |  |  |  |  |  |  |
Past medical history | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
Freq. of previous IMIs in 3 years prior to PHE | 0.235 | − 0.037 to 0.507 | 1.265 | 0.964 to 1.661 | 0.090 | 0.168 | − 0.015 to 0.350 | 1.182 | 0.986 to 1.419 | 0.0 | 0.120* | 1.128 |
Most recent previous IMI in 3 years prior to PHE |  |  |  |  |  |  |  |  |  |  |  |  |
 Never | Ref | Ref | Ref | Ref | Ref | - | - | - | - | - | - | - |
 < 6 months | 0.043 | − 0.892 to 0.978 | 1.044 | 0.410 to 2.660 | 0.928 | - | - | - | - | - | - | - |
 6–12 months | − 0.463 | − 1.317 to 0.392 | 0.630 | 0.268 to 1.480 | 0.289 | - | - | - | - | - | - | - |
 > 12 months | − 0.308 | − 1.056 to 0.440 | 0.735 | 0.348 to 1.553 | 0.420 | - | - | - | - | - | - | - |
Musculoskeletal examination | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | - | - |
 PROM hip internal rotation difference (deg.) | 0.008 | − 0.029 to 0.044 | 1.008 | 0.971 to 1.045 | 0.682 | - | - | - | - | - | - | - |
 PROM hip external rotation difference (deg.) | 0.024 | − 0.011 to 0.059 | 1.024 | 0.989 to 1.061 | 0.180 | - | - | - | - | - | - | - |
 Hip flexor length difference (deg.) | 0.026 | − 0.032 to 0.083 | 1.026 | 0.969 to 1.087 | 0.382 | - | - | - | - | - | - | - |
 Hamstring length/neural mobility difference (deg.) | − 0.007 | − 0.083 to 0.068 | 0.993 | 0.920 to 1.070 | 0.846 | - | - | - | - | - | - | - |
 Calf muscle length difference (deg.) | 0.018 | − 0.033 to 0.069 | 1.018 | 0.967 to 1.072 | 0.493 | - | - | - | - | - | - | - |
Lower extremity power | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 CMJ power (watts) | 0.000 | 0.000 to 0.001 | 1.000 | 1.000 to 1.001 | 0.394 | - | - | - | - | - | - | - |
Model Intercept | − 1.448 | − 4.564 to 1.668 | - | - | - | − 2.384 | − 3.558 to − 1.211 | - | - | - | − 1.786** | - |
Model performance statistics | Apparent performance (95% CI) | Apparent performance (95% CI)—before validation | Optimism-adjusted performance with 95% CI—after validation |  |  | |||||||
NagelkerkeR2 | 0.120 | 0.089 | 0.064 | Â | Â | |||||||
Calibration slope | 1.000 (0.608 to 1.392) | 1.000 (0.557 to 1.443) | 0.718 (0.275 to 1.161) | - | - | |||||||
CITL | 0.000 (− 0.233 to 0.233) | 0.000 (− 0.230 to 0.230) | − 0.009 (− 0.239 to 0.239) | - | - | |||||||
C-index | 0.670 (0.609 to 0.731) | 0.641 (0.580 to 0.703) | 0.589 (0.528 to 0.651) | - | - |