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In the Keep It Off randomized clinical trial we are evaluating this phone-based intervention that focuses on key weight-loss maintenance behaviors followed by continued self-monitoring, reporting of weight, feedback, and outreach in members of a Minnesota managed-care organization.
A universal reporting of weight would make comparison of results across studies simpler.
Another limitation is that postmenopausal mammograms were not taken on the same day as the reporting of weight.
This indicates that reporting of weight and height depend more on recall ability than on weighing and height measuring history.
13 Inaccurate reporting of weight and height may also result in incorrect estimates of the prevalence of overweight.
However, the analysis and reporting of weight loss data in aggregate can obscure individual responses to treatment.
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As WiFi technology becomes more widely available and reasonably priced, automated reporting of weights from a home scale to the research database would be a feasible option.
While there was substantial agreement between self-reported and measured BMI values, there was small but statistically significant under-reporting of weight and thus self-reported BMI.
The authors acknowledge that the study depends on self-reports of weight and eating habits, which are not always reliable, and that even though they controlled for many variables, the study was observational, showing only an association between breakfast eating habits and body mass, not a causal relationship.
Using self-reported weight and height data may raise concerns about systematic measurement error (in particular, systematic under-reporting of weight and/or systematic over-reporting of height), which could bias the results.
Using data from the National Health and Nutrition Examination Survey (NHANES) from 1999 to 2010, we find that self-reports of weight offer robust evidence of social desirability bias.
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