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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.