Patients with larger prostates ( > 60 cc) exhibited significantly higher grades of IPP, BWT, and PVRU (<i>p</i> < 0.001), indicating a progressive decline in bladder function as prostate volume increases.<h4>Conclusion</h4>This study confirms that IPP, BWT, and PVRU are strongly associated with prostate volume, with IPP emerging as a key predictor of urinary retention severity in patients with BPH. Here, IPP is linked to benign prostatic hyperplasia.