Construct validity of the impact of weight on quality of life questionnaire

KOLOTKIN, RONETTE L, SUSAN HEAD, ALAN BROOKHART. Construct validity of the Impact of Weight on Quality of Life questionnaire. 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 lif...

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Bibliographic Details
Published in:Obesity research 1997-09, Vol.5 (5), p.434-441
Main Authors: Kolotkin, R.L, Head, S, Brookhart, A
Format: Article
Language:English
Subjects:
Activities of Daily Living
Adult
BODY WEIGHT
CALIDAD DE VIDA
construct validity
effect of weight
Female
Food
Health Status
Humans
Interpersonal Relations
Male
Middle Aged
obesity
Obesity - psychology
Obesity - therapy
OVERWEIGHT
PESO CORPORAL
POIDS CORPOREL
QUALITE DE LA VIE
QUALITY OF LIFE
Self Concept
Sexuality
SOBREPESO
SURPOIDS
Surveys and Questionnaires
treatment outcome
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Summary:KOLOTKIN, RONETTE L, SUSAN HEAD, ALAN BROOKHART. Construct validity of the Impact of Weight on Quality of Life questionnaire. 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.
ISSN:1071-7323
1550-8528
DOI:10.1002/j.1550-8528.1997.tb00667.x