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Table 3 Incidence per 1,000 person-days of different types of musculoskeletal injuries and hazard ratios for changes in incidence between the intervention and control companies during prestudy and study periodsa

From: Neuromuscular training with injury prevention counselling to decrease the risk of acute musculoskeletal injury in young men during military service: a population-based, randomised study

Variable Company Prestudy period (n= 508/436)b Study period (n= 501/467)b Age-adjusted HR (95% CI) HR adjusted modelc (95% CI)
   Number Incidence Number Incidence   
Acute injuries, all Int 246 3.16 150 2.14 0.74 (0.52 to 1.06) 0.75 (0.51 to 1.09)
  Ctrl 149 2.73 155 2.44   
   Lower extremity Int 136 1.75 90 1.28 0.84 (0.55 to 1.30) 0.82 (0.52 to 1.31)
  Ctrl 91 1.67 96 1.51   
   Knee Int 50 0.64 48 0.68 1.05 (0.55 to 2.00) 1.32 (0.65 to 2.67)
  Ctrl 35 0.64 38 0.60   
   Ankle Int 37 0.48 17 0.24 0.38 (0.17 to 0.86) 0.34 (0.15 to 0.78)
  Ctrl 21 0.38 37 0.58   
   Upper extremity Int 53 0.68 31 0.44 0.57 (0.28 to 1.16) 0.52 (0.24 to 1.12)
  Ctrl 26 0.48 31 0.49   
Total number of off-duty daysd Int 917 11.8 546 7.8 0.46 (0.26 to 0.83) 0.55 (0.29 to 1.04)
  Ctrl 419 7.7 677 10.7   
Discharged from military servicee Int 34 0.44 42 0.60 0.78 (0.41 to 1.51) 0.81 (0.42 to 1.57)f
  Ctrl 26 0.48 52 0.82   
Follow-up days        
  Int 77,871 70,222   
  Ctrl 54,620 63,494   
  1. aHR, hazard ratio; 95% CI, 95% confidence interval; Int, intervention company; Ctrl, control company. HRs were calculated by using the Cox proportional hazard model if not otherwise mentioned. Statistical significance level was set at P < 0.05. HRs are based on the interaction term of each study group (intervention or control), and study period was entered into the model to analyse the difference in the change in incidence between the groups. bNumber of conscripts in the intervention and control companies per study period; cadjusted for age, urbanisation level of the home residence, smoking, alcohol intake, earlier musculoskeletal symptoms, orthopaedic surgeries, chronic disabilities due to earlier musculoskeletal injuries, school success, previous physical activity, waist circumference and conscript's physical fitness index (n = 11 adjusting variables); dbecause of acute injuries, rate ratio was obtained using a negative binomial model; eafter the 2-week run-in period; fnot adjusted for waist circumference or physical fitness level, since 36 discharged individuals had missing information.