Comparison of two questionnaires for assessing the severity of urinary incontinence: The ICIQ-UI SF versus the incontinence severity index

Authors

  • Atle Klovning,

    Corresponding author
    1. Department of Public Health and Primary Health Care, Section for General Practice, University of Bergen, Kalfarveien, 31, N-5018, Bergen, Norway
    2. Centre for Medical Web Research, Frederik Stangsgt 11/13, N-02104 Oslo, Norway
    • Section for General Practice, Institute of General Practice and Community Medicine, University of Oslo, Box 1130 Blindern, N-0318 Oslo, Norway.
    Search for more papers by this author
    • Senior Lecturer/General Practitioner.

  • Kerry Avery,

    1. Department of Social Medicine, University of Bristol, Bristol, UK
    Search for more papers by this author
    • Researcher.

  • Hogne Sandvik,

    1. Department of Public Health and Primary Health Care, Section for General Practice, University of Bergen, Kalfarveien, 31, N-5018, Bergen, Norway
    Search for more papers by this author
    • Senior Researcher/General Practitioner.

  • Steinar Hunskaar

    1. Department of Public Health and Primary Health Care, Section for General Practice, University of Bergen, Kalfarveien, 31, N-5018, Bergen, Norway
    Search for more papers by this author
    • Professor/General Practitioner.


  • Conflicts of Interest: none.

Abstract

Aims

To compare the International Consultation on Incontinence Questionnaire-Urinary Incontinence Short Form (ICIQ-UI SF) with the Incontinence Severity Index (ISI), and to propose intervals for four severity levels of ICIQ-UI SF.

Methods

Cross-sectional, Internet-based study of 1,812 women responding to a general health questionnaire. Four severity levels for the ICIQ-UI SF scores were constructed by iteratively adjusting the ranges for these levels until maximum Kappa scores were obtained when cross-tabulated with the ISI in a random sample of half of the women with urinary incontinence. Using these intervals, weighted Kappa was calculated for the remaining women as a validation process.

Results

Three hundred forty-three women had urinary incontinence, and completed the ISI and the ICIQ-UI SF. A high correlation between the ISI and ICIQ-UI SF scores with versus without the QoL item was found (Spearman's rho = 0.62, P < 0.01 vs. rho = 0.71, P < 0.01, respectively). Maximum Kappa with quadratic weighting was obtained for the following scale for the ICIQ-UI SF: slight (1–5), moderate (6–12), severe (13–18) and very severe (19–21) (Kappa = 0.61), and without the QoL item: slight (1–3), moderate (4–5), severe (6–9) and very severe (10–11) (Kappa = 0.71) in the development sample. Correspondingly, for the validating sample, maximum Kappa with quadratic weighting was 0.61 and 0.74.

Conclusions

A high correlation between the ICIQ-UI SF and the ISI was found. The ICIQ-UI SF may be divided into the following four severity categories: slight (1–5), moderate (6–12), severe (13–18) and very severe (19–21). Neurourol. Urodynam. 28:411–415, 2009. © 2009 Wiley-Liss, Inc.

Ancillary