Table 2. Descriptive statistics of test-retest by breathalyser without .000 readings.

	First reading (BAC)		Second reading (BAC)		Difference between samples (Absolute)		Correlation r1st−2nd	N
	$\overline{x}$	σ	$\overline{x}$	σ	$\left|\overline{x}\right|$	|σ|
Breathalyser 1	.086	.054	.083	.052	.004	.006	.992***	32
Breathalyser 2	.081	.045	.079	.045	.004	.005	.991***	27
Breathalyser 3	.053	.025	.053	.027	.003	.005	.980***	28
Breathalyser 4	.068	.041	.068	.041	.003	.004	.993***	32
All	.072	.044	.071	.044	.004	.005	.991***	119

Notes.

^***p < .001.