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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

FactorsJumps (n)Injuries (n)Incidence rate (/1000)P-value
Incidence95%CI
Type of aircraft    0.10
 Fixed-wing airplane364613837.8532.11–44.56 
 Helicopter10312827.1618.70–39.12 
Aircraft exit    <  0.01
 Side exit9275053.9441.04–70.52 
 Rear exit375011630.9325.83–36.99 
Time of the day    0.70
 Day407414335.1029.86–41.22 
 Night6032338.1425.28–56.85 
Jump with equipment    <  0.01
 Without368611531.2026.04–37.34 
 With equipment9915151.4639.25–67.14 
Motion sickness    <  0.01
 No455415233.3828.53–39.01 
 Yes12314113.8267.86–183.22 
Wind speed    0.167
  < 5 knots20196331.2024.41–39.77 
  ≥ 5 knots265810338.7532.02–46.81 
Temperature    0.718
  < 32 °C27409534.6728.42–42.23 
  ≥ 32 °C19377136.6529.11–46.03 
Age (year)    0.801
  < 20167423.956.52–61.33 
 20–24325411836.2630.02–43.43 
 24–299293133.3722.67–47.36 
  ≥ 293271339.7621.17–67.98 
Body mass index (kg/m2)    0.484
  < 23.00316210834.1628.01–41.23 
 23.00–2511494135.6825.61–48.41 
  ≥ 25.003661746.4527.06–74.37 
Rank    0.075
 Officer163742.9417.27–88.48 
 NCO348011131.9026.24–38.41 
 Cadet10344846.4234.23–61.55 
 Total467716635.5030.04–41.21 
  1. NCO: Noncommissioned officer