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Table 3 Poisson regression models for the risk of fatigue fractures in young Finnish men performing their compulsory military service

From: Regular physical exercise before entering military service may protect young adult men from fatigue fractures

 Univariate IRR (95% CI)MultivariateaIRR (95% CI)
Age (y) of military service0.95 (0.72 to 1.26) 
Class A of service3.30 (0.45 to 23.94) 
BMI0.96 (0.88 to 1.05) 
Smoking0.68 (0.32 to 1.44) 
Comprehensive school only0.75 (0.41 to 1.40) 
Self-reported pre-military service high physical activity0.41 (0.20 to 0.85)0.41 (0.20 to 0.85)
Diseases and injuries
 F00-F99 Mental and behavioural disorders0.45 (0.06 to 3.27) 
 H00–H59 Diseases of the eyes and adnexa0.89 (0.45 to 1.76) 
 J00–J99 Diseases of the respiratory system0.43 (0.13 to 1.40) 
 L00–L99 Diseases of the skin and subcutaneous tissue0.40 (0.05 to 2.88) 
 M00–M99 Diseases of the musculoskeletal system1.46 (0.57 to 3.70) 
Self-reported subjective symptoms on admission
 Injuries0.90 (0.32 to 2.52) 
 Symptoms of the musculoskeletal system0.25 (0.03 to 1.82) 
 Respiratory symptoms0.48 (0.19 to 1.23) 
 Mental symptoms2.09 (0.65 to 6.74) 
 Headache2.38 (0.93 to 6.04) 
  1. aForward stepwise selection. Only those variables shown which entered the model