Table 1

Demographic, military characteristic and type of diagnosis of the study cohort (n=16 153)

	Count	Per cent
Sex
Male	14 641	90.67
Female	1507	9.33
Total	16 148
Age
24 years or less	3134	19.42
25–35 years	7075	43.84
35–44 years	4049	25.09
45 years or more	1882	11.66
Total	16 140
Rank
Officer	2331	14.45
Senior NCM	2863	17.75
Junior NCM	10 940	67.81
Total	16 134
Component
Reserve Force	2339	14.48
Regular Force	13 812	85.52
Total	16 151
Element
Land	12 824	79.54
Sea	959	5.95
Air	2340	14.51
Total	16 123
Years of military service
5 years or less	5236	32.42
6–15 years	6240	38.64
16 years or more	4675	28.95
Total	16 151
Previous deployments
None	7516	46.96
1 or 2	5025	31.40
3 or more	3464	21.64
Total	16 005
Deployment length
<180 days	2284	14.16
180 or more days	13 853	85.84
Total	16 137
Combat exposure
1st tertile	4535	28.41
2nd tertile	6397	40.08
3rd tertile	5029	31.51
Total	15 961
MTBI
No injury	12 602	78.02
Other injury	2708	16.76
MTBI	843	5.22
Total	16 153
MHP*
No MHP	14 058	91.20
MHP	1356	8.80
Total	15 414
3 or more PCS
No	14 712	91.31
Yes	1401	8.69
Total	16 113

*Any mental disorder defined as any of the following: major depression (Patient Health Questionnaire (PHQ)-2), post-traumatic stress disorder (PTSD) (2-item PTSD checklist (PCL)) or panic disorder.
MHP, mental health problem; MTBI, mild traumatic brain injury; NCM, non-commissioned member; PCS, postconcussive symptoms.