Reliability and validity of the Tibetan version of the International Prostate Symptom Score.

ABSTRACT

OBJECTIVE: To validate the Tibetan version of the International Prostate Symptom Score (IPSS-Tib) in patients with and without urinary symptoms in a Tibetan population. METHODS: The validity and reliability of IPSS-Tib were studied in 85 patients with benign prostatic hyperplasia (BPH) and 62 controls without lower urinary tract symptoms (LUTS). Reliability was evaluated using the test-retest method and internal consistency using Cronbach's α, and the construct validity was assessed by the correlation between IPSS-Tib scores and quality of life questions (QoL-Tib). RESULTS: The Cronbach's α coefficient of the IPSS-Tib was 0.80 and of a single IPSS scoring item ranged from 0.77 to 0.86. The IPSS-Tib test-retest reliability was evaluated by the intraclass correlation coefficient, and its average value was 0.79 (P < 0.001). The mean (SEM, 95% CI) area under the ROC curve for the IPSS-Tib was 0.91 (0.87-0.96). The IPSS-Tib had a high correlation with the QoL-Tib (Spearman's rank correlation coefficient 0.84, P < 0.01). The mean IPSS score before transurethral resection of the prostate (TURP) was 21.9 (6.8), and dropped to 6.38 (1.54) after TURP (P < 0.001), and the average difference was 15.52 (6.23), related to the drop from 4.5 (0.9) to 1.46 (0.48) in the QoL (P < 0.001). CONCLUSION: The IPSS-Tib has good reliability and validity in the diagnosis and symptom severity assessment of patients with BPH in Tibetan areas. It is an ideal assessment tool that can be used in Tibetan-speaking areas for patients with BPH and as a method for evaluating postoperative curative effect assessment of patients with BPH.