Table 3

ACL injury risk by sex in members of the US Armed Forces, 2006–2018

Enlisted specialty	Artillery/Gunnery	Aviation	Engineers	Maintenance	Administration, intelligence and communication	Logistics	Maritime/Naval specialties	Total
RR (95% CI)	1.13 (0.93 to 1.37)	1.01 (0.75 to 1.36)	1.12 (0.79 to 1.58)	0.83 (0.79 to 0.87)	0.64 (0.61 to 0.37)	0.82 (0.77 to 0.87)	0.61 (0.48 to 0.77)	0.82 (0.80 to 0.83)
Risk difference (per 1000 person-years)	0.7	0.1	0.6	−0.9	−1.9	−1.0	−1.8	−0.9
AR (%)	11.3	1.2	10.4	−20.9	−56.2	−21.8	−64	−22.7
P value	0.22	0.94	0.54	<0.001	<0.001	<0.001	<0.001	<0.001
NNH	547	16 600	1586	−1173	−523	−1027	−558	−1134
Officer specialty	Ground/Naval gunfire	Aviation	Engineering and maintenance	Administration	Operations and intelligence	Logistics	Services	Total
RR (95% CI)	0.95 (0.75 to 1.19)	1.22 (1.01 to 1.47)	1.12 (0.98 to 1.29)	1.16 (1.00 to 1.35)	1.39 (1.22 to 1.59)	1.10 (0.96 to 1.27)	1.05 (0.97 to 1.14)	1.14 (1.09 to 1.19)
Risk difference (per 1000 person-years)	−0.2	0.8	0.5	0.6	1.6	0.5	0.2	0.5
AR (%)	−5.5	18.0	11.1	14	28.1	9.1	5.1	12.0
P value	0.64	0.03	0.10	0.05	<0.001	0.19	0.21	<0.001
NNH	−4631	1258	1875	1650	617	2185	4924	1836