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Table 2 Poisson regression model for number of knee disorders or injuries

From: Incidence and risk factors of exercise-related knee disorders in young adult men

  IRR (95% CI) P-value
Age 0.92 (0.87–0.96) <0.001
Military Service Class A 1.29 (1.05–1.57) 0.014
BMI (Body Mass Index)
  < 25.0 kg/m2 1.00 (Reference)  
 25.0–29.9 kg/m2 1.15 (1.03–1.30) 0.016
  ≥ 30 kg/m2 0.98 (0.80–1.20) 0.87
High physical activity 0.99 (0.90–1.10) 0.91
Smoking (cigarettes/day)
 0 1.00 (Reference)  
 1–9 1.24 (1.06 to 1.45) 0.009
 10–19 1.37 (1.21 to 1.55) <0.001
  ≥ 20 1.35 (1.11 to 1.64) <0.001
Comprehensive school only 1.10 (1.00–1.22) 0.046
Injuries 1.07 (0.93–1.23) 0.34
Symptoms of the musculoskeletal system 1.59 (1.39–1.82) <0.001
Symptoms of the respiratory system 1.17 (1.05–1.30) 0.005
Symptoms of the gastrointestinal system 1.67 (1.31–2.12) <0.001
Mental symptoms 0.82 (0.64–1.06) 0.13