title: Concordance of In-Home "Smart" Scale Measurement with Body Weight Measured In-Person.
abstract: OBJECTIVE
  Newer "smart" scales that transmit participants' body weights directly to data collection centers offer the opportunity to simplify weight assessment in weight management research; however, little data exist on the concordance of these data compared to weights measured at in-person assessments.
  
  
  METHODS
  We compared the weights of 58 participants (mean±SD BMI = 31.6±4.8, age = 52.1±9.7 years, 86.2% White, 65.5% Female) measured by study staff at an in-person assessment visit to weights measured on the same day at home using BodyTrace "smart" scales. These measures occurred after 3 months of an internet-based weight management intervention.
  
  
  RESULTS
  Weight (mean±SD) measured at the 3-month in-person assessment visit was 81.5±14.7kg compared to 80.4±14.5kg measured on the same day using in-home body weight scales; mean bias =1.1±0.8kg, 95% limits of agreement = -0.5 to 2.6. Two outliers in the data suggest that there may be greater variability between measurements for participants weighing above 110 kg.
  
  
  CONCLUSIONS
  Results suggest good concordance between the measurements and support the use of the BodyTrace smart scale in weight management research. Future trials using BodyTrace scales for outcome assessment should clearly define protocols for measurement and associated instructions to participants (e.g., instruct individuals to weigh at the same time of day, similarly clothed). Finally, measure concordance should be investigated in a group of individuals weighing more than 110kg.
authors: Weight Control & Diabetes Research Center, Alpert Medical School of Brown University & The Miriam Hospital, Providence, RI USA.
authors: Kathryn M
authors: KM
authors: Ross
authors: Weight Control & Diabetes Research Center, Alpert Medical School of Brown University & The Miriam Hospital, Providence, RI USA.
authors: Rena R
authors: RR
authors: Wing
keywords: Body Weight Measurement; Research Methods; Smart Scales; Weight Management