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

Matthew D Barber, Cathie Spino, Nancy K Janz, Linda Brubaker, Ingrid Nygaard, Charles W Nager, Thomas L Wheeler, Pelvic Floor Disorders Network, Mathew D Barber, Marie Fidela R Paraiso, J Eric Jelovsek, Firouz Daneshgari, Linda McElrath, Donel Murphy, Cheryl Williams, Anthony G Visco, Jennifer Wu, Alison Weidner, Cindy Amundsen, Mary J Loomis, Linda Brubaker, Kimberly Kenton, MaryPat FitzGerald, Elizabeth Mueller, Kathy Marchese, Mary Tulke, Holly E Richter, R Edward Varner, Robert L Holley, Thomas L Wheeler, Patricia S Goode, L Keith Lloyd, Alayne D Markland, Velria Willis, Velria Saxon, LaChele Ward, Lisa S Pair, Morton B Brown, Cathie Spino, John T Wei, Beverly Marchant, Donna DiFranco, John O L DeLancey, Dee Fenner, Nancy K Janz, Wen Ye, Zhen Chen, Yang Wang Casher, Joseph Schaffer, Clifford Wai, Marlene Corton, Gary Lemack, Kelly Moore, David Rahn, Amanda White, Shanna Atnip, Margaret Hull, Pam Martinez, Deborah Lawson, Ingrid Nygaard, Peggy Norton, Linda Freeman, Susan Meikle, Matthew D Barber, Cathie Spino, Nancy K Janz, Linda Brubaker, Ingrid Nygaard, Charles W Nager, Thomas L Wheeler, Pelvic Floor Disorders Network, Mathew D Barber, Marie Fidela R Paraiso, J Eric Jelovsek, Firouz Daneshgari, Linda McElrath, Donel Murphy, Cheryl Williams, Anthony G Visco, Jennifer Wu, Alison Weidner, Cindy Amundsen, Mary J Loomis, Linda Brubaker, Kimberly Kenton, MaryPat FitzGerald, Elizabeth Mueller, Kathy Marchese, Mary Tulke, Holly E Richter, R Edward Varner, Robert L Holley, Thomas L Wheeler, Patricia S Goode, L Keith Lloyd, Alayne D Markland, Velria Willis, Velria Saxon, LaChele Ward, Lisa S Pair, Morton B Brown, Cathie Spino, John T Wei, Beverly Marchant, Donna DiFranco, John O L DeLancey, Dee Fenner, Nancy K Janz, Wen Ye, Zhen Chen, Yang Wang Casher, Joseph Schaffer, Clifford Wai, Marlene Corton, Gary Lemack, Kelly Moore, David Rahn, Amanda White, Shanna Atnip, Margaret Hull, Pam Martinez, Deborah Lawson, Ingrid Nygaard, Peggy Norton, Linda Freeman, Susan Meikle

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.

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.

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Source: PubMed

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