Table 3.

Crude and adjusted odds ratio of accident risk (n = 5401)

Alcohol	Crude OR (95% CI)	Adjusted OR (95% CI)1
No alcohol (referent)
Alcohol alone	29.0 (11.5- 73.0)**	36.1 (13.2- 98.6)**
Alcohol combined	124.4 (22.5- 688.5)**	231.9 (33.3- 1615.4)**
Positive samples with no alcohol	Crude OR (95% CI)	Adjusted OR (95% CI)2
No non-alcohol psychoactive substances (referent)
One psychoactive substance	1.6 (0.5- 5.0)(ns)	1.4 (0.4- 4.4)(ns)
Two psychoactive substances	17.1 (5.6- 52.4)**	13.3 (4.2- 41.3)**
Three or more psychoactive substances	51.4 (11.3- 233.5)**	38.9 (8.2- 185.0)**

Chi-square test: ^(ns) = Not statistically significant, , ** = P < 0.001.

¹Adjusted for age group and day and time.

²Adjusted for age group.