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Table 2 Comparison of dial and digital scale absolute value of weight imprecision at various test loads

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

Calibration weight n Mean SD *P
Scale   (kg) (kg)  
10 kg     
  All scales 55 0.2 0.3  
  Dial 18 0.4 0.3 <0.001
  Digital 37 0.1 0.2  
25 kg     
  All scales 60 0.4 0.5  
  Dial 18 0.7 0.5 <0.001
  Digital 42 0.2 0.3  
50 kg     
  All scales 61 0.4 0.4  
  Dial 18 0.7 0.5 0.004
  Digital 43 0.3 0.3  
75 kg     
  All scales 61 0.6 0.6  
  Dial 18 1.0 0.7 <0.001
  Digital 43 0.4 0.4  
100 kg     
  All scales 60 0.7 0.7  
  Dial 18 1.2 0.9 0.001
  Digital 42 0.54 0.5  
110 kg     
  All scales 59 0.8 0.8  
  Dial 18 1.2 1.0 0.007
  Digital 41 0.6 0.6  
  1. SD = standard deviation, CW = calibration weight.
  2. *Data are from unpaired t-tests comparing the absolute values of imprecision at each test load registered by dial versus digital HBS.