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Table 1 Demographic and clinical characteristics recorded from the questionnaire regarding the presence of fatigue fractures

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

 Stress fractureNo stress fractureP value [statistics]
N443985 
Age (y), mean (SD)19.2 (0.6)19.2 (1.1)0.82 [t = 0.22]
Class A of service, n (%)43 (98)3683 (92)0.18 [x2 = 0.18]
Body mass index (BMI), mean (SD)22.7 (3.9)23.3 (3.8)0.32 [t = 1.00]
Smoking, n (%)9 (24)1152 (34)0.23 [x2 = 1.45]
Comprehensive school only, n (%)27 (63)2318 (58)0.56 [x2 = 0.33]
Self-reported high physical activity (more than twice a week, causing sweating and breathlessness) before military service, n (%)9 (20)1299 (38)0.017 [x2 = 5.71]
Diseases and injuries before entering service, n (%)
 F00-F99 Mental and behavioural disorders1 (2)177 (4)0.49 [x2 = 0.48]
 H00–H59 Diseases of the eyes and adnexa11 (25)1091 (27)0.72 [x2 = 0.12]
 J00–J99 Diseases of the respiratory system3 (7)589 (15)0.14 [x2 = 2.20]
 L00–L99 Diseases of the skin and subcutaneous tissue1 (2)229 (6)0.32 [x2 = 0.98]
 M00–M99 Diseases of the musculoskeletal system5 (11)343 (9)0.52 [x2 = 0.41]
Self-reported symptoms on admission, n (%)
 Injuries4 (9)414 (10)0.78 [x2 = 0.08]
 Symptoms of the musculoskeletal system1 (2)353 (9)0.12 [x2 = 2.36]
 Respiratory symptoms5 (11)836 (21)0.12 [x2 = 2.44]
 Symptoms of the gastrointestinal tract0 (0)88 (2)0.32 [x2 = 0.99]
 Mental symptoms3 (7)138 (3)0.20 [x2 = 1.46]
 Headache5 (11)211 (5)0.076 [x2 = 3.16]