Improving prostate cancer detection in veterans through the development of a clinical decision rule for prostate biopsy

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.

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