Variable | Company | Prestudy period (n= 166/133)c | Study period (n= 174/144)c | Age-adjusted HR (95% CI) | HR adjusted modeld (95% CI) | ||
---|---|---|---|---|---|---|---|
Number | Incidence | Number | Incidence | ||||
Acute injuries, all | Int | 83 | 3.37 | 60 | 2.47 | 0.77 (0.42 to 1.39) | 0.79 (0.41 to 1.51) |
Ctrl | 58 | 3.63 | 63 | 3.21 | |||
Lower extremity | Int | 53 | 2.15 | 32 | 1.32 | 0.84 (0.40 to 1.78) | 0.86 (0.38 to 1.92) |
Ctrl | 39 | 2.44 | 38 | 1.94 | |||
Knee | Int | 22 | 0.89 | 20 | 0.82 | 1.05 (0.37 to 2.99) | 1.48 (0.46 to 4.81) |
Ctrl | 13 | 0.81 | 14 | 0.71 | |||
Ankle | Int | 20 | 0.81 | 5 | 0.21 | 0.23 (0.06 to 0.85) | 0.17 (0.04 to 0.68) |
Ctrl | 9 | 0.56 | 17 | 0.87 | |||
Upper extremity | Int | 14 | 0.57 | 14 | 0.58 | 1.04 (0.30 to 3.62) | 0.93 (0.24 to 3.56) |
Ctrl | 10 | 0.63 | 8 | 0.41 | |||
Total number of off-duty dayse | Int | 303 | 12.3 | 203 | 8.4 | 0.69 (0.26 to 1.82) | 0.64 (0.23 to 1.79)f |
Ctrl | 198 | 12.4 | 217 | 11.1 | |||
Discharged from military serviceg | Int | 17 | 0.69 | 13 | 0.54 | 0.68 (0.24 to 1.97) | 0.72 (0.24 to 2.12)f |
Ctrl | 11 | 0.69 | 15 | 0.76 | |||
Follow-up days | |||||||
Int | 24,599 | 24,292 | |||||
Ctrl | 15,963 | 19,628 |