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Table 5 Incidence per 1,000 person-days of different types of musculoskeletal injuries and hazard ratios for change in incidence between the intervention and control companies during prestudy and study periods in low fitness conscriptsa,b

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= 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

  
  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. bThe lowest tertile of conscripts according to physical fitness (conscript's physical fitness index ≤14.04 points); cnumber of conscripts in the intervention and control companies per study period; dadjusted 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 and waist circumference (n = 10 adjusting variables); ebecause of acute injuries, rate ratio obtained from negative binomial model; fnot adjusted by waist circumference, since 16 discharged individuals had missing information; gafter the 2-week run-in period.