Table 1. Preliminary descriptive statistics and correlations of the test-retest of the four breathalysers with and without .000 readings.

	${\overline{x}}_{\mathrm{overall}}$	σoverall	First reading (r)	Second reading (r)	Time between (r)	Time since (r)
With .000a
1. First reading (BAC)	.059	.049	–	–	–	–
2. Second reading (BAC)	.058	.048	.994***	–	–	–
3. Time between samples (s)	30.51	12.36	.412***	.424**	–	–
4. Time since last drink (min)	30.69	36.25	−.201**	−.201**	.022	–
Without .000b
1. First reading (BAC)	.072	.044	–	–	–	–
2. Second reading (BAC)	.071	.044	.991***	–	–	–
3. Time between samples (s)	32.29	12.81	.326**	.343**	–	–
4. Time since last drink (min)	25.50	23.67	−.056	−.055	.067	–

Notes.

^aN = 146.

^bN = 119.

^**p < .01.

^***p < .001.