Table 4

Multivariate models for the prediction of various parachuting related* injury outcomes among US Army Airborne School trainees, 1985–2002

Model outcome	Ankle injury		Severe ankle injury†		Musculoskeletal injury‡		Any traumatic injury‡		Multiple injury
Model outcome	OR§	95% CI	OR	95% CI	OR	95% CI	OR	95% CI	OR	95% CI
*Parachuting cause of injury code.
†Ankle injury hospitalization with ankle procedure.
‡Excludes ankle injuries.
§Odds ratio, adjusted for all model covariates.
¶Jump week training dates were as follows: pre-brace (01/01/85–30/09/93), brace protocol (01/01/94–30/09/00), post-brace (01/10/00–31/12/02).
**Referent category.
Protocol¶
Pre-brace	2.38	1.92–2.95	2.05	1.63–2.57	1.78	1.27–2.50	1.81	1.42–2.32	2.40	1.27–4.53
Brace protocol	1.00**	–	1.00**	–	1.00**	–	1.00**	–	1.00**	–
Post-brace	1.72	1.27–2.32	1.77	1.30–2.42	0.92	0.53–1.60	0.96	0.64–1.44	1.81	0.76–4.30
Age at start of training
17–18	1.00**	–	1.00**	–	1.00**	–	1.00**	–	1.00**	–
19–20	1.20	0.90–1.60	1.36	0.99–1.87	1.11	0.71–1.74	1.18	0.86–1.63	1.26	0.54–2.95
21–22	1.79	1.33–2.42	1.88	1.35–2.63	1.22	0.74–2.02	1.17	0.81–1.68	1.46	0.57–3.70
23–24	1.84	1.33–2.54	2.01	1.41–2.87	1.22	0.70–2.11	1.31	0.88–1.93	1.70	0.64–4.53
25–29	2.71	2.03–3.63	2.99	2.16–4.12	1.63	0.99–2.68	1.80	1.27–2.56	2.77	1.17–6.56
30–34	3.18	2.22–4.56	3.42	2.30–5.10	2.97	1.68–5.26	2.38	1.53–3.69	5.39	2.11–13.77
35–56	4.89	3.04–7.85	5.54	3.32–9.25	4.07	1.86–8.91	3.21	1.72–5.99	3.67	0.78–17.36
Sex
Men					1.00**	–	1.00**	–
Women					1.97	1.24–3.14	1.74	1.23–2.47
Race/ethnicity
White	1.00**	–			1.00**	–			1.00**	–
Black	1.23	1.00–1.51			0.67	0.42–1.05			1.04	0.53–2.02
Other	1.25	0.97–1.60			1.54	1.05–2.27			1.95	1.04–3.63