Relationship between Lower Urinary Tract Symptoms (LUTS) Assessed by the IPSS and Erectile Function Assessed by the IIEF‑5: A Cross‑Sectional Study in Men Aged Over 40 Years in Brazzaville, Republic of Congo

Background: Lower urinary tract symptoms (LUTS) and erectile dysfunction (ED) are common conditions in men over 40 years and significantly impair quality of life. Objective : To evaluate and quantify the relationship between LUTS and erectile function in men aged over 40 years in Brazzaville. Methods: This was an analytical, prospective cross‑sectional study conducted during a health campaign at the Department of Urology‑Andrology, Brazzaville University Hospital. Sexually active men aged over 40 years were included consecutively. LUTS were assessed using the International Prostate Symptom Score (IPSS), and erectile function was assessed using the five‑item International Index of Erectile Function (IIEF‑5). Pearson correlation tests were performed, and multivariate linear regression was used to identify an independent association between the two scores after adjustment for potential confounders. Results: A total of 337 participants were included, with a mean age of 61 (SD: 8) years. LUTS were present in 93.8% of participants, mainly mild (44.2%) and moderate (40.7%). ED was reported by 76.3% of men, predominantly mild (27.9%). The IPSS was negatively correlated with the IIEF‑5 score (r = −0.35; p < 0.001), as were all individual items. After multivariate adjustment, higher IPSS scores remained significantly associated with lower IIEF‑5 scores (βa = −0.23; 95% CI [−0.32; −0.13]; p < 0.001). Conclusion: This study demonstrates a significant and independent correlation between LUTS and erectile function in men over 40 years.