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Table 4 Optimal cutoff points for the prognostic factors of rhabdomyolysis

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
  1. Abbreviations: z 1 = first cutoff point; z 2 = second cutoff point; z 3 = third cutoff point
  2. * Cutoff points for qtc (ECG QTc) are searched by the parametric method for normally distributed variables.
  3. ** Cutoff points for t (time from drug ingestion to arrival at hospital in hours) are searched assuming t is distributed log-normally.
  4. *** Cutoff points for bt (body temperature in degrees Celsius) are searched by the parametric method for variables with a common central tendency.
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