Table 3.

Multivariate Cox Regression Model Predicting Time to Initial Analgesic (Minutes)

Predictor	Hazard Ratio	95% CI	p value
SCD (ref RC)	0.61	0.49, 0.76	<0.01
Age in decades	1.02	0.94, 1.11	0.65
Male (ref female)	1.58	1.30, 1.92	<0.01
Days (ref nights)	0.44	0.35, 0.56	<0.01
Evenings (ref nights)	0.35	0.28, 0.45	<0.01
Nights (ref evenings)	2.8	2.21, 3.62	<0.01
Arrival pain score (z score)	1.17	1.06, 1.3	<0.01
Low acuity (ref high acuity)	0.42	0.34, 0.53	<0.01
Intravenous access obtained	1.4	1.09, 1.82	0.01