Similar findings were reported using data from two nationally representative surveys. A recent study reported that parents of overweight children ages 2 to 6 years old erroneously overestimated their child’s weight, but parents of older overweight children and adolescents underestimated their child’s weight. A child’s weight status as well as parental perception of their child’s weight affect accuracy of reports. In addition to parents reporting their own weight, they also may be asked to report the weight of their children. However, self-reported and expert-measured weights may differ by factors such as age, sex, and perceived weight status. Self-reported heights and weights are often used in public health research with adults, children and families because these data are easy and inexpensive to collect. Reminders to zero scales before each use may further improve accuracy of self-reported weight. Conclusionsĭigital home bathroom scales provide sufficiently accurate and consistent weights for public health research. Accuracy and precision did not vary by scale age.
Imprecision of dial scales was significantly greater than that of digital scales at all weights (p < 0.05). Digital scales accurately weighed test loads whereas dial-type scale weights differed significantly (p < 0.05). Before calibration, all digital scales displayed 0, but dial scales displayed a mean absolute initial weight of 0.95 (1.9 SD) kg. ResultsĪll participants reported using their scale on hard surface flooring. Data also were collected on frequency of calibration, age and floor surface beneath the scale. Trained researchers assessed accuracy and consistency using certified calibration weights at 10 kg, 25 kg, 50 kg, 75 kg, 100 kg, and 110 kg. Participants brought functioning bathroom scales (n = 18 dial-type, n = 43 digital-type) to a central location. The objective of this study was to evaluate the accuracy and consistency of digital versus dial-type bathroom scales commonly used for self-reported weight. Little is known about sources of error introduced by using bathroom scales to measure weight at home. Self-reported body weight is often used for calculation of Body Mass Index because it is easy to collect.
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