Table II.

Bivariate comparison of clinical variables missing from more than 10% of responses for patients with and without ciTBI^∗

Rates of	ciTBI present (n = 763)	ciTBI absent (n = 42 616)
Amnesia	0.559	0.169
History of emesis	0.332	0.132
Headache in the ED	0.72	0.444
History of LOC	0.639	0.115
Neurologic deficit	0.194	0.0136
History of seizure	0.0984	0.0129

ED, emergency department.

^∗All rates are significantly different (P < .0001 by χ² test).