Table 2.

The influence of breath test performance in relation to the mean bias of the BAC and the estimated BrAC (BrAC _est )

	N	Mean bias between the BAC and the BrAC est	Standard deviation	P-value
Forced expiration	10	−0.15	0.39
Non-forced expiration	57	0.05	0.32	0.09
Awake	63	−0.03	0.34
Sleeping or lowered level of consciousness	15	0.20	0.37	0.02

A p-value < 0.05 was considered significant.