106 Chapter 7 Table 4. Predicted probabilities and observed implant loss rates for each amount of risk factors Training cohort Validation cohort Number of risk factors Predicted probability* Reconstructions Implant loss Observed probability Reconstructions Implant loss Observed probability 0 4.5% - 7.2% 2142 125 5.8% 523 23 4.4% 1 7.2% - 14.5% 926 79 8.5 % 225 13 5.8% 2 11.6% - 22.8% 158 32 20.3% 30 6 20.0% 3 18.6% - 33.3% 8 2 25.0% 1 0 0.0% 4 33.3% - 38.0% 0 0 - 0 0 - * BMI (continuous variable) was dichotomized in BMI <30 (no risk factor) and ≥30 kg/m2 (risk factor)
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