Can self-reported body weight be used to evaluate long-term follow-up of a weight-loss program?

G. Tell,R. Jeffery,F. Kramer,M. K. Snell

Published 1987 in Journal of the American Dietetic Association

ABSTRACT

The purpose of this study was to determine whether former participants in weight-control programs would provide valid weight data by self-report in telephone interviews. Participants were 39 women and 107 men (aged 28 to 63 years) who were in year 4 or 5 post-treatment. These represented 95% of participants who had completed all annual clinic visits. Self-reported body weights obtained by telephone interview were validated against weight measured directly in a university clinic. Overall, self-reported weight was 5.9 lb (2.7 kg) (standard deviation = 7.0 lb) (2.9%) lower than the measured weight. Using regression analysis, the strongest predictor of measured weight was reported weight, for both men and women. The bias in self-report of weight seen here is of about the same magnitude and direction as that seen in population studies. We conclude that the use of self-reported weight is not adequate for the assessment of long-term weight-loss maintenance unless the magnitude of discrepancy is adjusted for.

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