From: Polychotomization of continuous variables in regression models based on the overall C index
4a Optimal cutoff points for qtc* | Â | Â | Â | Â |
---|---|---|---|---|
number of cutoff points | z 1 | z 2 | z 3 | C |
1 | 0.460 | Â | Â | 0.611 |
2 | 0.428 | 0.491 | Â | 0.634 |
3 | 0.410 | 0.460 | 0.509 | 0.642 |
continuous | Â | Â | Â | 0.651 |
4b Optimal cutoff points for t** (hours) | Â | Â | Â | Â |
number of cutoff points | z 1 | z 2 | z 3 | C |
1 | 7.74 | Â | Â | 0.751 |
2 | 4.99 | 12.16 | Â | 0.795 |
3 | 3.91 | 7.88 | 15.75 | 0.810 |
continuous | Â | Â | Â | 0.829 |
4c Optimal cutoff points for bt*** (Celsius) | Â | Â | Â | Â |
number of cutoff points | z 1 | z 2 | Â | C |
2 | 33.9 | 37.2 | Â | 0.640 |
continuous | Â | Â | Â | 0.675 |