Pelvic Floor Distress Inventory (PFDI - 20)

Original Editor - Kirsten Ryan

Top Contributors - Kirsten Ryan, Laura Ritchie and Tony Lowe  

Objective

Pelvic floor.jpg

The PFDI-20 is both a symptom inventory and a measure of the degree of bother and distress (quality-of-life) caused by pelvic floor symptoms.  It is a short-form version of the Pelvic Floor Distress Inventory.[1]

Intended Population

Women with disorders of the pelvic floor including urinary incontinence, pelvic organ prolapse, and fecal incontinence.[1]

Method of Use

The PFDI-20 includes 20 questions and 3 scales.  Each of the 3 scales is scored from 0 (least distress) to 100 (greatest distress).  The sum of the scores of these 3 scales serves as the overall summary score of the PFDI-20 and ranges from 0 - 300.  The 3 scales include questions taken from the following widely used outcome measures:  Urinary Distress Inventory - 6 questions, Pelvic Organ Prolapse Distress Inventory - 6 questions, and Colorectal-Anal Distress Inventory - 8 questions.[1]

Evidence

Reliability

The PFDI-20 has good test-retest reliability intraclass coefficient .86, P< .001.  Each of the 3 scales (Urinary Distress Inventory, Pelvic Organ Prolapse Distress Inventory, and Colorectal-Anal Distress Inventory) demonstrates significant correlation with their long-form scales (r = .86, r = .92, and  r = .93, respectively, P < .0001.[1]

Validity

The PFDI-20 demonstrates construct validity as it demonstrates a significant association with appropriate measures of symptom severity and pelvic floor diagnoses.[1]

Responsiveness

Each of the 3 scales of the PFDI-20 demonstrated moderate to excellent responsiveness with effect size and standardized response mean values ranging from .70 to 1.28.  The sensitivity of the PFDI-20 as a whole was excellent with an effect size of 1.48  P < .0001 and standardized response mean of 1.09 P < .0001.  The ability of the PFDI-20 to discriminate between subjects who indicated that they were "worse" after surgery from those who indicated they were "better" was excellent with c-statistic of .95.[1]

Miscellaneous

The strength of the PFDI-20 is that it is a short form that gives a comprehensive assessment of the effect of pelvic floor disorders on the quality of life of women, rather than assessing just one aspect of pelvic floor function such as urinary incontinence.  A more generic quality-of-life form as the SF-36 has demonstrated poor responsiveness in patients undergoing treatment for urinary incontinence.  In these patient populations, it may be important to use both a generic quality-of-life instrument and a condition-specific instrument that has demonstrated responsiveness.  The PFDI-20 is easy to use in both clinical and research settings.[1]

The MCID (clinically meaningful change in quality of life[2]) needs to be studied in larger populations.[1]

Links

Overview of PFDI-20 on the Rehabilitation Measures Database.

Link to the PFDI-20 on Beaumont Women's Health Center Website.

Paper by Barber et al 2005 describing the development of the PFIQ-7

Recent Related Research (from Pubmed)

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References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Barber MD, Walters MD, Bump RC. Short forms of two condition-specific quality-of-life questionnaires for women with pelvic floor disorders (PFDI-20 adn PFIQ-7). Am J Obstet Gynecol 2005;193:103-113.
  2. Crosby RD, Kolotkin RL, Rhys Willisams G. Defining clinicallyfckLRmeaningful change in health-related quality of life. J ClinfckLREpidemiol 2003;56:395-407