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# |