Table 12

Case example utilizing method 2, cut-point 1
Prob. .41/1-.41 = -0.16 Patients value Parameter estimate Pt. value *Parameter estimate Intercept
HGB 15.2 -0.378 -5.74 -5.10
RBC 4.50 -0.764 -3.44
Black (Yes=1) 0 0.361 0.00
Age 60 0.018 1.08
PSA 4.3 0.033 0.129
Creatinine 1.65 -0.601 -0.99
MCV 90.00 0.050 4.5
sum of B*value 2.42
Plus intercept=Sum -2.68

The probability of this cut-point is .41, therefore the Log OR p/1 – p = .41/1-.41, thus the cut-point is −0.16. (If the number yielded from the equation is above this value, the patient should be referred for prostate biopsy). The patient is a 60 year old, Caucasian male with a recent PSA test value of 4.3 ng/dL. In addition, he had additional lab work to include a HGB, RBC count, MCV, Creatinine, and a negative test for Hematuria. Utilizing method 2, cut-point 1, the Patient’s PBCDR total sum is -2.68, which is less than -0.16. Therefore, the recommendation is no biopsy for the patient.

Hill et al.

Hill et al. BMC Urology 2013 13:6   doi:10.1186/1471-2490-13-6

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