Table 2.

Coefficient estimates and 95% confidence intervals for alcohol-relation at the median of the emergency department length of stay by mechanism of injury

Variablea)	Motor vehicle injury	Fall/slip	Cut/pierce	Collison	Miscellaneous
Alcohol-relation
Unrelated	Reference	Reference	Reference	Reference	Reference
Related	24.3 (17−31.6)	9.8 (6.9−12.7)	20 (16.1−23.9)	18.3 (15.2−21.5)	8 (2.2−13.8)
Age (yr)
19−29	Reference	Reference	Reference	Reference	Reference
30−44	1.5 (-1.2−4.1)	5 (2.2−7.8)	6 (3.5−8.5)	0.9 (-1.7−3.5)	5 (2.6−7.4)
45−64	8.5 (5.5−11.6)	13.6 (10.6−16.6)	11 (8−14)	6.5 (3.6−9.4)	8 (5.2−10.8)
≥ 65	17.2 (12.1−22.2)	26.2 (22.6−29.8)	16 (10.8−21.2)	13.2 (8.7−17.7)	21 (14.9−27.1)
Sex
Female	Reference	Reference	Reference	Reference	Reference
Male	2.1 (-0.2−4.3)	8.2 (5.9−10.5)	6 (3.9−8.1)	11.1 (8.9−13.2)	2 (-0.1−4.1)
GCS
15	Reference	Reference	Reference	Reference	Reference
< 15	103.6 (66.1−141.1)	67.8 (45.2−90.4)	27 (-66.9−120.9)	98.3 (65.1−131.5)	38 (31−45)
EMR-ISS
<9	Reference	Reference	Reference	Reference	Reference
≥9	29.2 (25.9−32.4)	40.4 (35.4−45.4)	29 (17.6−40.4)	41.4 (36.2−46.6)	13 (4.6−21.4)
EMS use
No use	Reference	Reference	Reference	Reference	Reference
Use	38.8 (35.7−42)	41 (36.9−45.1)	48 (41.8−54.2)	34.6 (30−39.2)	39 (31.8−46.2)
Time of visit
Nighttime	Reference	Reference	Reference	Reference	Reference
Daytime	6.3 (4−8.6)	13.8 (11.4−16.2)	11 (8.8−13.2)	13.9 (11.7−16.2)	19 (16.7−21.3)
Day of visit
Weekend	Reference	Reference	Reference	Reference	Reference
Weekday	1.5 (-0.8−3.9)	6.4 (4.2−8.6)	2 (-0.1−4.1)	3.5 (1.4−5.6)	6 (3.9−8.1)

GCS, Glasgow Coma Scale; EMR-ISS, Excess Mortality Ratio-adjusted Injury Severity Score; EMS, emergency medical service.

^a)Other covariates in each model included hospital site.