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Evaluating the 8-item overactive bladder questionnaire (OAB-v8) using item response theory.

Alexander C Peterson1, Anika Sehgal2, R Trafford Crump3

  • 1Centre for Health Services and Policy Research, University of British Columbia, Vancouver, British Columbia, Canada.

Neurourology and Urodynamics
|October 5, 2017
PubMed
Summary

The Overactive Bladder version 8 (OAB-v8) questionnaire is reliable for screening overactive bladder symptoms in a wide patient range. It should not be scored differently for men and women, though women report higher symptom bother.

Keywords:
OAB-v8lower urinary tract symptomsoveractivepatient reported outcome measurespsychometricsquality of lifereliability and validityurinary bladdervalidation studies

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Area of Science:

  • Urology
  • Patient-Reported Outcomes
  • Psychometrics

Background:

  • The Overactive Bladder version 8 (OAB-v8) is a patient-reported outcome measure for overactive bladder (OAB) screening and symptom bother assessment.
  • Validation of the OAB-v8 using modern psychometric methods is essential for its clinical utility.

Purpose of the Study:

  • To validate the OAB-v8 questionnaire using item-response theory (IRT).
  • To assess the OAB-v8's dimensionality, reliability, and validity.
  • To determine if the OAB-v8 requires different scoring for men and women.

Main Methods:

  • Secondary analysis of prospectively recruited patients with lower urinary tract symptoms.
  • Item-response theory (IRT) applied to evaluate OAB-v8 characteristics.
  • Differential item functioning (DIF) analysis to assess sex-based scoring differences.

Main Results:

  • The OAB-v8 demonstrated high reliability (Cronbach's alpha = 0.901) and essential unidimensionality.
  • Women reported higher average symptom bother scores than men (P=0.005).
  • No evidence of differential item functioning was found between sexes.

Conclusions:

  • The OAB-v8 is a reliable instrument suitable for a broad patient population.
  • No sex-specific scoring adjustments are needed for the OAB-v8.
  • Items 5 and 6 may require re-wording due to high item correlation.