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Table 4 Incidence rate of military static line parachute injuries stratified by each factor

From: Incidence and risk factors associated with injuries during static line parachute training in Royal Thai Army

Factors

Jumps (n)

Injuries (n)

Incidence rate (/1000)

P-value

Incidence

95%CI

Type of aircraft

    

0.10

 Fixed-wing airplane

3646

138

37.85

32.11–44.56

 

 Helicopter

1031

28

27.16

18.70–39.12

 

Aircraft exit

    

<  0.01

 Side exit

927

50

53.94

41.04–70.52

 

 Rear exit

3750

116

30.93

25.83–36.99

 

Time of the day

    

0.70

 Day

4074

143

35.10

29.86–41.22

 

 Night

603

23

38.14

25.28–56.85

 

Jump with equipment

    

<  0.01

 Without

3686

115

31.20

26.04–37.34

 

 With equipment

991

51

51.46

39.25–67.14

 

Motion sickness

    

<  0.01

 No

4554

152

33.38

28.53–39.01

 

 Yes

123

14

113.82

67.86–183.22

 

Wind speed

    

0.167

  < 5 knots

2019

63

31.20

24.41–39.77

 

  ≥ 5 knots

2658

103

38.75

32.02–46.81

 

Temperature

    

0.718

  < 32 °C

2740

95

34.67

28.42–42.23

 

  ≥ 32 °C

1937

71

36.65

29.11–46.03

 

Age (year)

    

0.801

  < 20

167

4

23.95

6.52–61.33

 

 20–24

3254

118

36.26

30.02–43.43

 

 24–29

929

31

33.37

22.67–47.36

 

  ≥ 29

327

13

39.76

21.17–67.98

 

Body mass index (kg/m2)

    

0.484

  < 23.00

3162

108

34.16

28.01–41.23

 

 23.00–25

1149

41

35.68

25.61–48.41

 

  ≥ 25.00

366

17

46.45

27.06–74.37

 

Rank

    

0.075

 Officer

163

7

42.94

17.27–88.48

 

 NCO

3480

111

31.90

26.24–38.41

 

 Cadet

1034

48

46.42

34.23–61.55

 

 Total

4677

166

35.50

30.04–41.21

 
  1. NCO: Noncommissioned officer