Table 1.

Demographics and service history.

Variables	Breachers/range staff (n = 19)	CAF controls (n = 19)	Mean difference (95% CI)	Bootstrap ratio	P
Age (years)	33 (27-38)	32 (27.5–35.5)	0.8 (−4.4–5.7)	3.2	0.742
Sex–(n, % male)	17 (89.5)	17 (89.5)	0 (−21.1–21.1)	0	0.790
Military service (years)	11.3 (9–14.5)	5 (1.5–10.2)	6.4 (3.2–10.3)	3.7	<0.001
Exposure to explosives (years)	10 (7.5–12)	0 (0–0)	10.4 (8–13.1)	8.0	<0.001
Breaching (years)	7 (4.5–10)	0 (0–0)	7.1 (5.2–9.3)	7.2	<0.001
Combat deployment	11 (64.7)	0 (0)	68.2 (47.4–89.5)	6.3	<0.001
Status
Regular Force	9 (47.4)	8 (42.1)	5.8 (−21.1–31.6)	0.4	0.546
Reservist	10 (52.6)	11 (57.9)	5.8 (−21.1–31.6)	0.4	0.546
Rank
Junior NCM	5 (26.3)	13 (68.4)	−42.4 (−68.4 to −10.5)	2.8	0.004
Senior NCM	12 (63.2)	0 (0)	63 (42–84.5)	5.4	<0.001
Junior Officer	2 (10.5)	6 (31.6)	−20.6 (−47.4–10.5)	1.4	0.098
Education
High School	6 (31.6)	4 (21.1)	10.6 (−21.1–42.1)	0.7	0.378
College	6 (31.6)	4 (21.1)	10.5 (−15.8–36.8)	0.8	0.310
Undergraduate	5 (26.3)	10 (52.6)	−26 (−52.6–5.3)	1.7	0.056
Graduate	1 (0.5)	1 (0.5)	0.4 (−15.8–15.8)	0	0.658
None	1 (0.5)	0	5.2 (0–15.8)	1	0.312

Continuous/integer data presented as the median and interquartile range–med (iqr); categorical data presented as the frequency and percent = n (%). CAF, Canadian Armed Forces; NCM, Non-commissioned member. Significance corrected at a false discovery rate of p = 0.05 (bold p-values), derived from bootstrapped mean difference testing. For categorical variables, the mean difference was evaluated on the percent of individuals categorized to each outcome (see section Methods).