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Table 3 Unadjusted and adjusted PRs of reporting three or more PCS (N = 3351)

From: Deployment-related mild traumatic brain injury, mental health problems, and post-concussive symptoms in Canadian armed forces personnel

Covariate Unadjusted PR (95% confidence interval) Adjusted* PR (95% confidence interval)
Injury status Non-TBI Injury 1.00 1.00
Less severe mTBI 1.61(1.33-1.95) p < 0.0001 0.97(0.82-1.15)
More severe mTBI 2.04(1.66-2.50) p < 0.0001 1.16(0.98-1.38)
Combat exposure 1st Tertile 1.00 1.00
2nd Tertile 1.16(0.87-1.55) 0.94(0.73-1.22)
3rd Tertile 1.82(1.40-2.37) p < 0.0001 1.07(0.83-1.38)
Age 24 years or less 1.00 1.00
25 - 34 years 1.22(0.98-1.52) 1.19(0.98-1.43)
35-44 years 1.20(0.94-1.52) 1.21(0.97-1.51)
45 or more 1.05(0.78-1.42) 1.42(0.86-1.22)
Sex Male 1.00 1.00
Female 1.50(1.16-1.93) p = 0.002 1.34(1.10-1.63) p = 0.004
Language English 1.00 1.00
Non-English 0.82(0.67-1.00) p = 0.049 1.02(0.86-1.22)
Element Land 1.00 1.00
Sea 0.69(0.45-1.04) 0.79(0.53-1.17)
Air 0.75(0.57-0.99) p = 0.04 0.87(0.67-1.11)
Rank Junior NCM 1.00 1.00
Senior NCM 1.05(0.87-1.27) 0.96(0.81-1.14)
Officer 0.52(0.37-0.74) p = 0.0003 0.76(0.50-0.98)
Any MHP No 1.00 1.00
Yes 8.28(7.10-9.66) p < 0.0001 7.77(6.60-9.15) p < 0.0001
  1. *Adjusted for injury status, combat exposure, age, sex, language, component, element, rank and MHP.
  2. More and less severe mTBI included those with and without loss of consciousness or post-traumatic amnesia, respectively.
  3. Junior non-commissioned member (NCM) includes rank of Master Corporal (or equivalent) or below.
  4. §Senior non-commissioned member (NCM) includes rank of Sergeant (or equivalent) or above.
  5. Tertiles are computed relative to a larger reference population, which accounts for the uneven distribution of cases.