J. Med. Internet Res. - Longitudinal accuracy of web-based self-reported weights: results from the Hopkins POWER Trial.

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Resumo

CKGROUND: Websites and phone apps are increasingly used to track weights during weight loss interventions, yet the longitudinal accuracy of these self-reported weights is uncertain.OBJECTIVE: Our goal was to compare the longitudinal accuracy of self-reported weights entered online during the course of a randomized weight loss trial to measurements taken in the clinic. We aimed to determine if accuracy of self-reported weight is associated with weight loss and to determine the extent of misclassification in achieving 5% weight loss when using self-reported compared to clinic weights.METHODS: This study examined the accuracy of self-reported weights recorded online among intervention participants in the Hopkins Practice-Based Opportunities for Weight Reduction (POWER) trial, a randomized trial examining the effectiveness of two lifestyle-based weight loss interventions compared to a control group among obese adult patients with at least one cardiovascular risk factor. One treatment group was offered telephonic coaching and the other group was offered in-person individual coaching and group sessions. All intervention participants (n=277) received a digital scale and were asked to track their weight weekly on a study website. Research staff used a standard protocol to measure weight in the clinic. Differences (self-reported weight - clinic weight) indicate if self-report under (-) or over (+) estimated clinic weight using the self-reported weight that was closest in time to the clinic weight and was within a window ranging from the day of the clinic visit to 7 days before the 6-month (n=225) and 24-month (n=191) clinic visits. The absolute value of the differences (absolute difference) describes the overall accuracy.RESULTS: Underestimation of self-reported weights increased significantly from 6 months (mean -0.5 kg, SD 1.0 kg) to 24 months (mean -1.1 kg, SD 2.0 kg; P=.002). The average absolute difference also increased from 6 months (mean 0.7 kg, SD 0.8 kg) to 24 months (mean 1.3, SD 1.8 kg; P<.001). Participants who achieved the study weight loss goal at 24 months (based on clinic weights) had lower absolute differences (P=.01) compared to those who did not meet this goal. At 24 months, there was 9% misclassification of weight loss goal success when using self-reported weight compared to clinic weight as an outcome. At 24 months, those with self-reported weights (n=191) had three times the weight loss compared to those (n=73) without self-reported weights (P<.001).CONCLUSIONS: Underestimation of weight increased over time and was associated with less weight loss. In addition to intervention adherence, weight loss programs should emphasize accuracy in self-reporting.TRIAL REGISTRATION: ClinicalTrials.gov: NCT00783315; http://clinicaltrials.gov/show/NCT00783315 (Archived by WebCite at http://www.webcitation.org/6R4gDAK5K).

Resumo Limpo

ckground websit phone app increas use track weight weight loss intervent yet longitudin accuraci selfreport weight uncertainobject goal compar longitudin accuraci selfreport weight enter onlin cours random weight loss trial measur taken clinic aim determin accuraci selfreport weight associ weight loss determin extent misclassif achiev weight loss use selfreport compar clinic weightsmethod studi examin accuraci selfreport weight record onlin among intervent particip hopkin practicebas opportun weight reduct power trial random trial examin effect two lifestylebas weight loss intervent compar control group among obes adult patient least one cardiovascular risk factor one treatment group offer telephon coach group offer inperson individu coach group session intervent particip n receiv digit scale ask track weight week studi websit research staff use standard protocol measur weight clinic differ selfreport weight clinic weight indic selfreport estim clinic weight use selfreport weight closest time clinic weight within window rang day clinic visit day month n month n clinic visit absolut valu differ absolut differ describ overal accuracyresult underestim selfreport weight increas signific month mean kg sd kg month mean kg sd kg p averag absolut differ also increas month mean kg sd kg month mean sd kg p particip achiev studi weight loss goal month base clinic weight lower absolut differ p compar meet goal month misclassif weight loss goal success use selfreport weight compar clinic weight outcom month selfreport weight n three time weight loss compar n without selfreport weight pconclus underestim weight increas time associ less weight loss addit intervent adher weight loss program emphas accuraci selfreportingtri registr clinicaltrialsgov nct httpclinicaltrialsgovshownct archiv webcit httpwwwwebcitationorgrgdakk

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