Accuracy and consistency of weights provided by home bathroom scales

BMC Public Health

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

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

SD = standard deviation, CW = calibration weight.
*Data are from unpaired t-tests comparing the absolute values of imprecision at each test load registered by dial versus digital HBS.

ISSN: 1471-2458