Table 2.

PROSTQA Model–Predicted Probabilities of Men Having Functional Erections Suitable for Intercourse 2 Years After Radical Prostatectomy

Planned Surgical Technique	Patient Age, y	Pretreatment PSA Level, ng/mL	Predicted Functional Erections After Treatment, % (95% CI) (by Pretreatment Sexual HRQOL Score)a,b
			67	83	100
Nerve-sparing	50	≤10	35 (25–45)	52 (43–61)	70 (61–77)
		>10	18 (9–34)	32 (18–49)	50 (32–68)
	60	≤10	23 (18–30)	38 (33–44)	57 (49–64)
		>10	11 (0–21)	21 (12–34)	36 (22–53)
	70	≤10	15 (10–22)	26 (19–35)	43 (32–55)
		>10	7 (3–14)	13 (7–24)	24 (13–41)
Non–nerve-sparing	50	≤10	13 (5–30)	23 (9–46)	39 (18–64)
		>10	6 (2–18)	11 (4–31)	21 (7–48)
	60	≤10	8 (3–19)	14 (6–32)	27 (12–50)
		>10	3 (1–11)	7 (2–19)	13 (4–34)
	70	≤10	5 (2–12)	9 (3–22)	17 (7–37)
		>10	2 (1–7)	4 (1–12)	8 (3–23)

Abbreviations: HRQOL, health-related quality of life; PROSTQA, Prostate Cancer Outcomes and Satisfaction With Treatment Quality Assessment; PSA, prostate-specific antigen.

^aSpecific values of pretreatment sexual functioning (Expanded Prostate Cancer Index Composite scores of 67, 83, and 100; range of 0–100, with a higher score representing better function) are tabulated to represent cohort distribution (25th, 50th, and 75th percentiles of scores among prostatectomy-treated patients) as well as to reflect a clinically relevant set of possible pretreatment sexual functioning. Across all treatment groups, these percentiles correspond to 358 patients (36%) with pretreatment sexual HRQOL scores of 67 or less, 441 (45%) with scores of 68–99, and 186 (19%) with scores of 100.

^bIndividual model-predicted probabilities were calculated using the inverse logistic function {exp[X′ β]/[1 + exp(X′ β)]}, where X′ β is the sum with X representing individual characteristics observed and β representing the associated model parameter estimates for the individual characteristics in Table 1.