Table 2

Univariate cox regression results for any injury and any time-loss injury

Variable	Level of variable	Any injury				Any time-loss injury
Variable	Level of variable	n	HR	95% CI	p Value^*	HR	95% CI	p Value^*
Age (years)					<0.01			<0.01
	17–19	144	1.00		Referent	1.00		Referent
	20–24	278	0.76	0.59 to 0.99	0.04	0.71	0.54 to 0.95	0.02
	25–29	151	0.99	0.74 to 1.32	0.94	0.71	0.51 to 0.98	0.04
	30–43	73	0.50	0.33 to 0.76	<0.01	0.34	0.20 to 0.57	<0.01
Height (cm)					0.85			0.99
	159–173	168	1.00		Referent	1.00		Referent
	174–178	162	1.04	0.78 to 1.38	0.79	1.01	0.73 to 1.39	0.96
	179–183	170	1.02	0.77 to 1.35	0.91	1.00	0.73 to 1.37	0.99
	184–198	160	0.92	0.69 to 1.23	0.57	0.96	0.69 to 1.33	0.81
Body mass (kg)					0.69			0.53
	53–71	165	1.00		Referent	1.00		Referent
	72–78	167	0.85	0.64 to 1.13	0.26	0.82	0.60 to 1.13	0.24
	79–86	165	0.90	0.68 to 1.19	0.47	0.89	0.65 to 1.22	0.48
	87–129	163	0.88	0.66 to 1.16	0.36	0.80	0.58 to 1.11	0.18
Body mass index (kg/m²)					0.11			0.67
	16.6–22.3	165	1.00		Referent	1.00		Referent
	22.4–24.5	165	1.32	1.00 to 1.75	0.05	1.03	0.75 to 1.40	0.88
	24.6–26.8	165	0.97	0.72 to 1.29	0.82	0.88	0.64 to 1.22	0.45
	26.9–35.7	165	1.03	0.77 to 1.38	0.83	0.87	0.63 to 1.20	0.39
1.5 Mile run-time (min)					0.79			0.83
	7.42–9.27	149	1.00		Referent	1.00		Referent
	9.28–9.67	144	0.90	0.67 to 1.21	0.49	0.95	0.67 to 1.34	0.77
	9.68–10.18	141	0.95	0.71 to 1.28	0.74	1.11	0.79 to 1.55	0.55
	10.19–13.72	142	0.86	0.64 to 1.17	0.34	0.99	0.70 to 1.40	0.95
No of sit-ups in 2 min					0.68			0.11
	34–55	145	1.00		Referent	1.00		Referent
	56–62	151	0.97	0.71 to 1.32	0.84	1.08	0.76 to 1.54	0.66
	63–70	147	1.10	0.82 to 1.49	0.52	1.45	1.04 to 2.03	0.03
	71–110	135	1.14	0.84 to 1.55	0.40	1.08	0.75 to 1.54	0.69
No of push-ups in 2 min					0.20			0.91
	21–50	152	1.00		Referent	1.00		Referent
	51–57	159	1.07	0.80 to 1.43	0.64	1.01	0.73 to 1.40	0.93
	58–64	125	0.85	0.62 to 1.17	0.31	0.90	0.63 to 1.28	0.55
	65–98	142	1.19	0.89 to 1.60	0.24	0.99	0.71 to 1.38	0.94
Time served in the army (years)					0.05			<0.01
	0.3–1.6	165	1.00		Referent	1.00		Referent
	1.7–3.2	146	0.95	0.72 to 1.27	0.74	0.89	0.65 to 1.21	0.45
	3.3–5.9	147	0.72	0.54 to 0.97	0.03	0.64	0.46 to 0.90	0.01
	6.0–25.2	151	0.73	0.55 to 0.98	0.04	0.52	0.37 to 0.74	<0.01
Military rank					0.01			<0.01
	Private	463	1.00		Referent	1.00		Referent
	JNCO	135	0.71	0.54 to 0.93	0.01	0.61	0.44 to 0.83	<0.01
	SNCO/officer	58	0.64	0.43 to 0.95	0.03	0.26	0.14 to 0.49	<0.01
Infantry regiment					0.35			0.02
	1 RA	215	1.00		Referent	1.00		Referent
	1 IG	206	1.09	0.84 to 1.42	0.50	1.44	1.07 to 1.94	0.02
	4 Rifles	239	1.20	0.94 to 1.53	0.15	1.44	1.08 to 1.91	0.01
Ethnicity	White	558	1.00		Referent	1.00		Referent
Ethnicity	Other	96	1.20	0.91 to 1.58	0.20	1.09	0.79 to 1.49	0.61
No of cigarettes smoked (per day)					0.52			0.30
	0	303	1.00		Referent	1.00		Referent
	1–9	94	1.14	0.84 to 1.54	0.41	0.99	0.70 to 1.41	0.96
	10–20	232	1.14	0.91 to 1.43	0.27	1.19	0.92 to 1.54	0.18
	21–50	15	0.76	0.36 to 1.62	0.48	0.57	0.21 to 1.55	0.27
Average UK units^† of alcohol consumed (per day)					0.79			0.33
	0	57	1.00		Referent	1.00		Referent
	0.1–3.0	218	0.86	0.59 to 1.26	0.44	0.76	0.51 to 1.15	0.20
	3.1–6.0	129	0.81	0.54 to 1.21	0.30	0.66	0.42 to 1.04	0.07
	6.1–20	175	0.87	0.59 to 1.28	0.48	0.82	0.54 to 1.25	0.35
Rating of amount of physical activity^‡	Less/same	347	1.00		Referent	1.00		Referent
Rating of amount of physical activity^‡	More/lot more	303	1.28	1.04 to 1.57	0.02	1.26	1.00 to 1.59	0.05
Weekly jog/run training frequency					0.61			0.03
	≤1	100	1.00		Referent	1.00		Referent
	2–3	365	1.11	0.82 to 1.49	0.50	1.05	0.76 to 1.44	0.79
	≥4	189	1.00	0.72 to 1.38	0.98	0.71	0.49 to 1.03	0.07
Weekly physical activity time (min)					0.04			0.06
	0–150	115	1.00		Referent	1.00		Referent
	151–300	220	1.00	0.74 to 1.37	0.98	0.98	0.68 to 1.39	0.90
	>300	319	1.30	0.98 to 1.73	0.07	1.30	0.94 to 1.80	0.11
Weekly endurance training time (min)					0.17			0.21
	0–150	287	1.00		Referent	1.00		Referent
	151–300	228	1.18	0.94 to 1.48	0.15	1.04	0.80 to 1.34	0.79
	>300	139	0.92	0.70 to 1.21	0.55	0.78	0.57 to 1.07	0.12
Weekly strength training time (min)					0.05			0.33
	0	85	1.00		Referent	1.00		Referent
	1–150	367	1.35	0.96 to 1.89	0.09	1.23	0.84 to 1.79	0.29
	>150	199	1.56	1.09 to 2.23	0.01	1.35	0.91 to 2.02	0.14
Previous lower limb injuries	No	235	1.00		Referent	1.00		Referent
Previous lower limb injuries	Yes	421	1.47	1.18 to 1.83	<0.01	1.25	0.96 to 1.57	0.10
Previous lower back injuries	No	459	1.00		Referent	1.00		Referent
Previous lower back injuries	Yes	197	1.28	1.03 to 1.58	0.03	1.14	0.89 to 1.46	0.30

↵* From Wald statistic.
↵† One UK unit alcohol is equivalent to 8 g ethanol.
↵‡ Compared with their peers.
1 IG, 1 Irish Guards; 1 RA, 1 Royal Anglian; JNCO, junior non-commissioned officer; SNCO, senior non-commissioned officer.