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