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Randomized Controlled Trial
. 2009 May;200(5):580.e1-7.
doi: 10.1016/j.ajog.2009.02.007.

The minimum important differences for the urinary scales of the Pelvic Floor Distress Inventory and Pelvic Floor Impact Questionnaire

Matthew D Barber  1 , Cathie Spino, Nancy K Janz, Linda Brubaker, Ingrid Nygaard, Charles W Nager, Thomas L Wheeler; Pelvic Floor Disorders Network
Collaborators, Affiliations
Randomized Controlled Trial

The minimum important differences for the urinary scales of the Pelvic Floor Distress Inventory and Pelvic Floor Impact Questionnaire

Matthew D Barber et al. Am J Obstet Gynecol. 2009 May.

Abstract

Objective: We sought to estimate the minimum important difference (MID) for the Urinary Distress Inventory (UDI), UDI-stress subscale of the Pelvic Floor Distress Inventory, and Urinary Impact Questionnaire (UIQ) of the Pelvic Floor Impact Questionnaire.

Study design: We calculated MID using anchor- and distribution-based approaches from a randomized trial for nonsurgical stress incontinence treatment. Anchors included a global impression of change, incontinence episodes from a urinary diary, and the Incontinence Severity Index. Effect size and standard error of measurement were the distribution methods used.

Results: Anchor-based MIDs ranged from -22.4 to -6.4 points for the UDI, -16.5 to -4.6 points for the UDI-stress, and -17.0 to -6.5 points for the UIQ. These data were supported by 2 distribution-based estimates.

Conclusion: Reasonable estimates of MID are 11, 8, and 16 points for the UDI, UDI-stress subscale, and UIQ, respectively. Statistically significant improvements that meet these thresholds should be considered clinically important.

Trial registration: ClinicalTrials.gov NCT00270998.

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Figures

Figure 1
Figure 1
Minimally important differences (MID) for Urinary Distress Inventory (UDI), Urinary Distress Inventory – Stress subscale(UDI-Stress) and Urinary Impact Questionnaire (UIQ) for Anchor- and Distribution-Based Methods.
See this image and copyright information in PMC

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