Construct validity of the Impact of Weight on Quality of Life Questionnaire.

Journal Article (Journal Article)

The Impact of Weight on Quality of Life questionnaire (IWQOL) is a 74-item self-report, condition-specific instrument that (1) assesses the effect of weight on quality of life in eight key areas, and (2) may be used as a treatment outcome measure and/or an evaluation tool for healthcare policy makers and third-party payers. This study explores IWQOL construct validity and provides new information on internal consistency, treatment effects, and differences between men and women. IWQOL total scores correlated highly with other measures of overall quality of life, and subscale scores correlated well with counterparts in the assessment battery. Internal consistency estimates for the IWQOL scales generally were high. For the women, 4-week participants, and the total sample, pretreatment-posttreatment differences were significant for all IWQOL scales and total score. For men, treatment differences were significant for the total score and all subscales except for Work and Mobility. Treatment differences for 2-week participants were significant for all scales except for Work. Consistent with previous IWQOL study results, the Comfort With Food scale scores reflected more discomfort at posttreatment as compared with pretreatment. The IWQOL, already translated into French and Italian, currently is demonstrating clinical and research utility as a quality-of-life outcome measure for clinical trials of antiobesity drugs and surgical treatments for patients with obesity.

Full Text

Duke Authors

Cited Authors

  • Kolotkin, RL; Head, S; Brookhart, A

Published Date

  • September 1997

Published In

Volume / Issue

  • 5 / 5

Start / End Page

  • 434 - 441

PubMed ID

  • 9385618

International Standard Serial Number (ISSN)

  • 1071-7323

Digital Object Identifier (DOI)

  • 10.1002/j.1550-8528.1997.tb00667.x


  • eng

Conference Location

  • United States