Table 1 Demographic and clinical characteristics recorded from the questionnaire regarding the presence of fatigue fractures
Stress fracture | No stress fracture | P value [statistics] | |
|---|---|---|---|
N | 44 | 3985 | |
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 disorders | 1 (2) | 177 (4) | 0.49 [x2 = 0.48] |
H00–H59 Diseases of the eyes and adnexa | 11 (25) | 1091 (27) | 0.72 [x2 = 0.12] |
J00–J99 Diseases of the respiratory system | 3 (7) | 589 (15) | 0.14 [x2 = 2.20] |
L00–L99 Diseases of the skin and subcutaneous tissue | 1 (2) | 229 (6) | 0.32 [x2 = 0.98] |
M00–M99 Diseases of the musculoskeletal system | 5 (11) | 343 (9) | 0.52 [x2 = 0.41] |
Self-reported symptoms on admission, n (%) | |||
Injuries | 4 (9) | 414 (10) | 0.78 [x2 = 0.08] |
Symptoms of the musculoskeletal system | 1 (2) | 353 (9) | 0.12 [x2 = 2.36] |
Respiratory symptoms | 5 (11) | 836 (21) | 0.12 [x2 = 2.44] |
Symptoms of the gastrointestinal tract | 0 (0) | 88 (2) | 0.32 [x2 = 0.99] |
Mental symptoms | 3 (7) | 138 (3) | 0.20 [x2 = 1.46] |
Headache | 5 (11) | 211 (5) | 0.076 [x2 = 3.16] |