Accuracy of Smart Scales on Weight and Body Composition: Observational Study

Background Smart scales are increasingly used at home by patients to monitor their body weight and composition, but scale accuracy has not often been documented. Objective The goal of the research was determine 3 commercially available smart for composition compared with dual x-ray absorptiometry (DEXA) as gold standard. Methods We designed a cross-sectional study in consecutive evaluated DEXA physiology unit tertiary hospital France. There were no exclusion criteria except patient declining participate. Patients weighed one immediately after DEXA. Three (scale 1: Body Partner [Téfal], 2: DietPack [Terraillon], 3: Cardio [Nokia Withings]). determined absolute error between standard values obtained from mass, fat lean mass. Results sample analysis included 53, 52, 48 each tested scales, respectively. median 0.3 kg (interquartile range [IQR] –0.1, 0.7), 0 (IQR –0.4, 0.3), 0.25 –0.10, 0.52), For errors –2.2 –5.8, 1.3), –4.4 –6.6, 0), –3.7 –8.0, 0.28), muscular –3.65 –8.03, Factors associated mass measurement 1 2 (P=.03 P<.001, respectively), BMI (P=.034 (P<.001), bone (P<.001 both). P=.004, both), P=.002, respectively). Conclusions accurate should replace care. Trial Registration ClinicalTrials.gov NCT03803098; https://clinicaltrials.gov/ct2/show/NCT03803098