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Table 1 Demographic and clinical characteristics of conscripts before entry into the military service stratified by knee symptoms during military service

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

Characteristic Knee symptoms during military service
Yes N = 853 No N = 3176 P-value
Age at military service, year, mean (SD) 19.2 (1.0) 19.3 (1.2) 0.094
Military Service Class A, n (%) 811(95.1) 2915 (91.8) <0.001
BMI, mean (SD) 23.1 (3.7) 23.3 (3.8) 0.26
Smoking (cigarettes/day), n (%)    0.004
 0 458 (62.6) 1834 (37.4)  
 1–9 62 (8.5) 263 (9.7)  
 10–19 150 (20.5) 474 (17.4)  
  ≥ 20 61 (8.3) 151 (5.5)  
Comprehensive school only, n (%) 499 (58.6) 1846 (58.5) 0.96
High physical activity, n (%) 283 (38.8) 1025 (37.6) 0.56
Diseases and injuries detected by military physicians, n (%)
Mental or behavioral disorders 9 (1.1) 169 (5.3) <0.001
 Diseases of the eye and adnexa 219 (25.7) 883 (27.8) 0.22
 Diseases of the respiratory system 142 (16.6) 450 (14.2) 0.069
 Diseases of the skin and subcutaneous tissue 46 (5.4) 184 (5.8) 0.65
 Diseases of the musculoskeletal system 84 (9.8) 264 (8.3) 0.16
 Injuries 103 (12.1) 315 (9.9) 0.067
 Flatfoot deformity, n (%) 14 (1.6) 78 (2.5) 0.16
Subjective symptoms reported in official questionnaire before entering military service, n (%)
 Symptoms of the musculoskeletal system 93 (10.9) 261 (8.2) 0.014
 Symptoms of the respiratory system 195 (22.9) 646 (20.3) 0.11
 Symptoms of the gastrointestinal system 25 (2.9) 63 (2.0) 0.093
 Mental symptoms 24 (2.8) 117 (3.7) 0.22