TITLE

Dieting for Dollars

AUTHOR(S)
Phillips, Barbara A.
PUB. DATE
November 2007
SOURCE
Internal Medicine Alert;11/15/2007, Vol. 29 Issue 21, p161
SOURCE TYPE
Periodical
DOC. TYPE
Article
ABSTRACT
THIS WAS A PROSPECTIVE, RANDOMIZED STUDY OF 3 MATCHED groups of overweight workers who were recruited from North Carolina colleges by email, letters, and flyers. Internet access was required to participate in order to fill out surveys and undergo initial screening. Overall, the 201 participants had a mean BMI of 33 kg/m2, 89% were white, a majority were between 35 and 54 years old, and 76% were women. The participants were divided into three groups for the first 3 months: those who were encouraged to lose weight and received no immediate financial incentive, but were paid $14 for each percentage point of weight lost at 6 months; those who received $14 for each percentage point of weight lost from baseline to three months but no further incentive at 6 months, and those who received $7 for each percentage point of weight loss from baseline at baseline and another $7 for each further percentage point of weight lost at 6 months. Thus, at the end of the 6 month study period, payments were essentially equalized, so that all participants were able to earn $14 for each percentage of weight loss from baseline at either 3 or 6 months. For example, even if a person were in the group that received no payment for weight lost at 3 months, he/she could be paid $14 per percentage point weight loss at 6 months. In addition, everyone received $5 for attending the 3 month and the 6 month weigh-ins. At the first weigh-in (3 months) those who were paid the most in the shortest time frame ($14 per percentage lost in the first 3 months) lost the most weight: an average of 4.7 pounds. They were also more likely to attend the weigh-in, and to have lost 5% of their initial weight at 3 months. Those who were paid $7 per percentage point lost an average of 3 pounds and those who were not scheduled to get paid until 6 months had only lost 2 pounds at three months. At 6 months, the biggest differences were in attrition from the study! A third of those who were paid $7 at each weigh-in had dropped out, compared with about half of those in either the deferred payment (54%) or early payment (45%) groups. Thus, analysis of the final results was hampered by the fact that only slightly more than half the participants still remained in the study. At 6 months (largely because of attrition) average weight loss between groups and the likelihood of achieving a 5% weight loss were not statistically different between groups, using an intention-to-treat approach. Try as I might, I was unable to tell from this paper if the group that was paid earliest was able to maintain the weight loss. However, those who were heavier to begin with lost the most weight, and those in the North Carolina University system lost more weight than those in the North Carolina Community College system. Non-whites were more likely to attend both weigh-ins than whites were, and the authors speculated that the modest financial incentives offered in this study might have represented a larger relative financial inducement to those with lower incomes. In their discussion, they note that the average payout at 3 months to those who were paid the highest amount at the shortest time period was $35 per subject. The authors concluded that "modest financial incentives can be effective in motivating overweight employees to lose weight."
ACCESSION #
27617538

 

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