Brief communication (Original). Validity and reliability of Thai version Overactive Bladder Symptom Score (OABSS-T)

Background: Overactive bladder (OAB) is a symptom-based condition, difficult to evaluate and impairs human related quality of life. A questionnaire is essential for the diagnosis and evaluation of treatment outcomes. The Overactive Bladder Symptom Score (OABSS) questionnaire has been mentioned previously as a useful tool for quantifying symptoms, severity, and treatment outcomes.

Objectives: To examine the psychometric properties of the OABSS in Thai women with overactive bladder.

Methods: Sixty women aged over 18 years, diagnosed with overactive bladder syndrome were recruited. They visited in two sessions at a two-week intervals using an OABSS questionnaire translated into Thai by a group of translators comprised of bilingual doctors and native speakers. OABSS in Thai preserves the original format using seven questions.

Results: Sixty woman aged over 18 years with overactive bladder symptoms were recruited (mean age 56; SD17.8). Content validity revealed a high score of symptoms. Internal consistency of the questionnaire from both visits showed a Cronbach alpha at 0.80 and 0.82 respectively. There was a strong association between the seven-item OABSS score at visit 1 and visit 2 with an intraclass correlation coefficient (ICC) of 0.96 (95% CI 0.947-0.981).

Conclusion: The OABSS Thai version is valid, and easily evaluates symptoms and severity of OAB. It could be used not only by urologists, but also by other healthcare providers as a screening tool for OAB in Thailand.