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Table 1 Scale accuracy: mean weights registered by scales compared to calibration weight tested

From: Accuracy and consistency of weights provided by home bathroom scales

Calibration weight n Mean SD  
Scale   (kg) (kg) P*
10 kg     
  All scales 55 9.8 0.3 0.007
  Dial 18 9.5 0.4 <0.001
  Digital 37 9.9 0.2 >0.05
25 kg     
  All scales 60 24.5 0.5 0.002
  Dial 18 24.0 0.5 <0.001
  Digital 42 24.8 0.4 >0.05
50 kg     
  All scales 61 49.4 0.6 >0.05
  Dial 18 49.1 0.7 0.013
  Digital 43 49.6 0.5 >0.05
75 kg     
  All scales 61 74.1 0.8 0.084
  Dial 18 73.2 0.7 <0.001
  Digital 43 74.4 0.5 0.037
100 kg     
  All scales 61 98.1 6.4 >0.05
  Dial 18 97.2 0.9 0.001
  Digital 43 98.1 7.6 >0.05
110 kg     
  All scales 59 108.7 1.1 >0.05
  Dial 18 107.7 1.0 0.001
  Digital 41 109.2 0.8 >0.05
Weight of researcher 1     
  (Mean weight = 70.1 kg research scaleused as accuracy standard)
  All scales 61 69.2 9.2 0.005#
  Dial 18 70.3 10.1 <0.001#
  Digital 43 68.8 8.8 >0.05#
Weight of researcher 2 holding 10 kg weight close to his/her body (Mean weight = 71.0 kg on research scale used as accuracy standard)
  All scales 61 70.2 9.5 0.020#
  Dial 18 70.7 0.2 <0.001#
  Digital (n = 43) 43 70.1 9.3 >0.05#
  1. SD = standard deviation, CW = calibration weight.
  2. *One sample t-test (calibration weight compared to weight registered on scale; except for researchers’ weights).
  3. #Paired t-tests (researcher weight on research scale compared to researcher weight registered on scale).