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Adaptation and validation of the Michigan Incontinence Severity Index in a Turkish population

Authors Sargın MA, Yassa M, Taymur BD, Ergun E, Akca G, Tug N

Received 11 February 2016

Accepted for publication 31 March 2016

Published 26 May 2016 Volume 2016:10 Pages 929—935

DOI https://doi.org/10.2147/PPA.S106209

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Lucy Goodman

Peer reviewer comments 2

Editor who approved publication: Dr Johnny Chen

Mehmet Akif Sargin, Murat Yassa, Bilge Dogan Taymur, Emrah Ergun, Gizem Akca, Niyazi Tug

Department of Obstetrics and Gynecology, Fatih Sultan Mehmet Training and Research Hospital, Istanbul, Turkey

Objective: To translate and validate the Michigan Incontinence Severity Index (M-ISI) for its use in Turkish-speaking women with urinary incontinence.
Methods: The translation and cross-cultural adaptation were based on international guidelines. Content validity by content validity ratio/content validity index, internal consistency by Cronbach’s alpha, test–retest reliability by Pearson’s correlation, and construct validity by using Spearman rank correlations to show the relationship between individual items and the relevant domains and subdomains were analyzed in 100 female participants with a chief complaint of urinary incontinence. Correlations between the relevant scores of M-ISI and The International Consultation on Incontinence Questionnaire – Short Form scores were analyzed to indicate convergent validity. The Varimax rotation method was used to conduct exploratory factor analysis in order to investigate the factor structures/distribution of M-ISI items.
Results: Content validity index and content validity ratio values increased to 0.97 and 1.00, respectively, showing sufficient content validity of the Turkish version of the M-ISI. The analysis formed three factors which was slightly different from original developers. In our proposed three-factor construct, all of the ten items demonstrated high correlations with their subdomains and lower correlations with the other domains, indicating good construct validity. Correlations between stress urinary incontinence and urge urinary incontinence (UUI) scores and The International Consultation on Incontinence Questionnaire – Short Form scores were found high, which indicated convergent validity (r: 0.953, P<0.001). Good internal consistency of the scores for each subdomain was observed (stress urinary incontinence, 0.787; UUI, 0.862; pad usage and bother, 0.832). Test–retest reliability was shown for each subdomain (stress urinary incontinence, 0.973; UUI, 0.973; pad usage and bother, 0.979).
Conclusion: The translated and cross-culturally adapted M-ISI showed good validity, reproducibility, and reliability that allow its use in Turkish-speaking populations with urinary incontinence. Its comprehensive structure means that it has become a practical instrument that is available for utilization in the primary health care setting, clinical research, and epidemiological trials in Turkey.

Keywords: bother, questionnaires, pad use, reliability and validity, translations, urinary incontinence

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