Prostate symptom relief only partly tracks erectile function gains over 12 weeks

A retrospective cohort study now published in BMC Urology suggests the two move together only weakly, and that symptom scores alone cannot stand in for a direct measure of sexual function.

Researchers led by Xiaoting Wang and Dawei Jiang analyzed records from 122 men with CP/CPPS who were already receiving usual care. To be included, patients had to have reported sexual activity during both questionnaire reference periods and to have completed both a baseline and a week-12 assessment on two standard instruments: the National Institutes of Health Chronic Prostatitis Symptom Index (NIH-CPSI), which quantifies pain, urinary symptoms and quality-of-life impact, and the 5-item International Index of Erectile Function (IIEF-5), a brief self-report measure of erectile function.

Improvement was defined arithmetically for each patient: the baseline NIH-CPSI score minus the week-12 score, so that larger positive values indicate greater symptom relief, and the week-12 IIEF-5 score minus the baseline score, where larger values indicate better erectile function. Over the 12-week window, the group improved on both fronts. Mean NIH-CPSI scores fell by 6.0 points (95% confidence interval 5.3 to 6.6), and mean IIEF-5 scores rose by 1.9 points (95% confidence interval 1.3 to 2.5).

The central question was whether these two changes track each other within individuals. The answer, statistically, was only partially. The Spearman rank correlation between symptom improvement and erectile-function improvement was 0.32, with a bootstrap 95% confidence interval of 0.14 to 0.48 based on 10,000 resamples. That is a modest positive association: real, but far from the near-lockstep relationship that would justify using one score as a proxy for the other.

Regression models sharpened the point. In an unadjusted model relating improvement to improvement, each additional 1-point gain on the NIH-CPSI corresponded to a 0.33-point greater gain on the IIEF-5 (95% confidence interval 0.17 to 0.49). When the authors instead modeled week-12 IIEF-5 as the outcome in an analysis of covariance adjusted for baseline values, the coefficient was essentially unchanged at 0.33 (95% confidence interval 0.16 to 0.51). The consistency across specifications suggests the association is not an artifact of the particular modeling choice, though the effect size remains small in clinical terms.

A secondary, exploratory analysis using the standard IIEF-5 cutoff for erectile dysfunction underscored how limited the coupling is. Among the 104 men whose baseline IIEF-5 scores met the threshold for erectile dysfunction, 71 — 68.3% — still scored at or below that cutoff at week 12. In other words, even as most patients reported meaningful relief from prostatitis symptoms over three months, roughly two-thirds of those with baseline erectile dysfunction showed no shift across the diagnostic line.

The authors are explicit about what the numbers do and do not mean. Because the data come from retrospective review of routine care rather than a randomized trial, the findings describe associations among concurrent changes and cannot establish that symptom improvement causes erectile improvement, or that any specific treatment produced either. The conclusions state that NIH-CPSI improvement should not be used as a proxy for concurrent erectile-function improvement, and that direct assessment of erectile function remains necessary.

For clinicians, the practical message is straightforward: a patient whose pelvic pain and urinary scores improve substantially may still report persistent erectile difficulties, and vice versa. Measuring both domains separately, with validated instruments at defined intervals, is the only way to know where a given patient stands.

Subject of Research: The relationship between changes in chronic prostatitis/chronic pelvic pain syndrome symptoms and erectile function over 12 weeks

Article Title: Relationship between changes in CP/CPPS symptoms and erectile function over 12 weeks: a retrospective cohort study

Article References: Wang, X., Ying, Z., Guo, H., Zhang, X., & Jiang, D. (2026). Relationship between changes in CP/CPPS symptoms and erectile function over 12 weeks: a retrospective cohort study. BMC Urology. https://doi.org/10.1186/s12894-026-02366-0

Image Credits: AI Generated

DOI: 10.1186/s12894-026-02366-0

Keywords: chronic prostatitis, CP/CPPS, erectile dysfunction, NIH-CPSI, IIEF-5, retrospective cohort study, BMC Urology, urology, men's health, symptom scores, correlation analysis, Relationship