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 |