Table 3.

Bivariate Cox Regression Model of Time to Discharge

Variable	Hazard ratio* (95% CI)	p value
Patient Variables
Age (for every additional 1 year of age)	.95 (.86, 1.06)	.39
Gender
Male	1 (reference)	.45
Female	.84 (.54, 1.31)
Prior Concussions
No	1 (reference)	.70
Yes	.90 (.54, 1.5)
Past Medical History
No	1 (reference)	.61
Yes	1.11 (.74, 1.67)
Family History
No	1 (reference)	.55
Yes	.88 (.58, 1.33)
Injury-related Variables
Mechanism of Injury
Non-sport	1 (reference)	.35
Sport	.82 (.54, 1.24)
Loss of Consciousness
No	1 (reference)	.54
Yes	1.2 (.68, 2.12)
Post-traumatic Amnesia
No	1 (reference)	.16
Yes	1.39 (.88, 2.19)
Clinical Variables
# of Physical Symptoms at initial evaluation (for each additional symptom) (10 total)	.73 (.65, .83)	<.001
# of Cognitive Symptoms at initial evaluation (for each additional symptom) (4 total)	.74 (.58, .94)	.01
# of Mood Symptoms at initial evaluation (for each additional symptom) (4 total)	.73 (.55, .97)	.03
# of Sleep Symptoms at initial evaluation (for each additional symptom) (4 total)	.61 (.44, .84)	.003
# of Symptom Domains at initial evaluation (for each additional domain) (4 total)	.70 (.60, .82)	<.001

^*Hazard ratio <1 indicates a lower chance of discharge from specialty concussion care at any given number of days post-injury