Table 1:

Patient characteristics and CT findings in the entire study population and in the subpopulation selected for telephone interview

Findings	Entire Population^* (n = 312)		Subpopulation (n = 206)				P Value^†
	Entire Population^* (n = 312)		Reached (n = 87)		Not reached (n = 119)
	No.	%	No.	%	No.	%
Patient
Mean age^‡ (range)	47.2 (17.0–93.3)		50.5 (17.5–86.6)		45.1 (17.7–93.3)		.043
Male sex	238	76	59	68	106	89	.000
Died	22	7.1	0	0	14	12	.001
Intoxication	118	38	33	38	57	48	.154
Clinical
GCS score = 15	185	59	49	56	71	60	.631
GCS score = 14	90	29	27	31	33	28	.606
GCS score = 13	37	12	11	13	15	13	.993
LOC	227	73	60	69	89	75	.356
PTA	239	77	66	76	90	76	.969
Persistent amnesia	83	27	24	28	26	22	.343
Seizure^§	6	1.9	0	0	3	2.5	.136
Headache	212	68	67	77	87	73	.524
Vomiting	69	22	23	26	24	20	.290
Neurologic deficit	48	15	14	16	21	18	.769
Infraclavicular injury	121	23	19	22	27	23	.885
CT
Intracranial lesions	243	78	63	72	92	77	.421
Linear fracture	114	37	41	47	44	37	.144
Skull base fracture	82	26	29	33	26	22	.066
Depressed fracture	19	6.1	3	3.4	14	12	.032
Subdural hematoma							.033
Mild	58	19	23	26	16	14
Severe	9	2.9	2	2.3	3	2.6
Epidural hematoma							.332
Mild	31	9.9	8	9.2	14	12
Severe	4	1.3	0	0.0	2	1.7
SAH	86	28	30	34	30	25	.148
Contusion	142	46	28	32	51	43	.120
Diffuse axonal injury	14	4.5	2	2.3	7	5.9	.214

Note:—LOC indicates loss of consciousness; PTA, posttraumatic amnesia; SAH, traumatic subarachnoid hemorrhage.
* Multiple symptoms and clinical and CT findings may be present in 1 patient.
† P values <.05 indicate differences between patients who were reached compared with those who were not reached for telephone interview (independent samples t test for continuous, Pearson χ² test for nominal, and Mann-Whitney U test for ordinal variables).
‡ Age in years.
§ Post-traumatic seizure.