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. Author manuscript; available in PMC: 2018 Jul 1.

Published in final edited form as: J Neuropsychiatry Clin Neurosci. 2017 Jan 25;29(3):254–259. doi: 10.1176/appi.neuropsych.16050100

Table 4.

Outcomes of single versus multiple head injuries during military service

Outcome	Single head injury	Multiple head injuries

	n (%)	n (%)	χ²	P value
PTSD	26 (28.0)	62 (62.3)	22.5661	<0.0001
Depression	41 (44.8)	61 (61.7)	5.4111	0.0200
Suicidal ideation	16 (17.3)	31 (31.4)	5.1371	0.0234
Violence	16 (16.9)	20 (19.8)	0.2674	0.6051
Back pain	50 (54.0)	74 (74.8)	9.0900	0.0026
Headache	55 (59.8)	63 (63.8)	0.3254	0.5684
Any pain	52 (56.5)	74 (75.4)	7.5518	0.0060