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Table 1 Demographic characteristics and risk factors associated with pre-admission DVT

From: Clinical predictors for deep vein thrombosis on admission in patients with intertrochanteric fractures: a retrospective study

Variables All patients (n = 788) Patients without DVT(n = 624) Patients with DVT (n = 164) P value
Age (mean years±SD) 78.68 ± 7.89 78.49 ± 8.00 79.38 ± 7.44 0.199
Gender (Male/Female)     0.07
 Male 273 (34.6%) 226 (36.2%) 47 (28.7%)  
 Female 515 (65.4%) 398 (63.8%) 117 (71.3%)  
BMI (kg/m2)     0.005*
  < 30 756 (95.9%) 605 (97.0%) 151 (92.1%)  
  > 30 32 (4.1%) 19 (3.0%) 13 (7.9%)  
Injury side (left/right)     0.327
 Left 416 (52.8%) 335 (53.7%) 81 (49.4%)  
 Right 372 (47.2%) 289 (46.3%) 83 (50.6%)  
Injury mechanism     0.002*
 Low energy trauma 716 (90.9%) 577 (92.5%) 139 (84.8%)  
 High energy trauma 72 (9.1%) 47 (7.5%) 25 (15.2%)  
Time from injury to admission (days) 2.10 ± 1.79 1.87 ± 1.59 2.96 ± 2.22 < 0.001†
Hemoglobin(g/L) 113.92 ± 19.09 115.45 ± 18.93 108.13 ± 18.62 < 0.001†
Comorbidities
 Hypertension 440 (55.8%) 350 (56.1%) 90 (54.9%) 0.781
 Diabetes 238 (30.2%) 171 (27.4%) 67 (40.9%) 0.001*
 COPD 87 (11.0%) 54 (8.7%) 33 (20.1%) < 0.001*
 Atrial fibrillation 60 (7.6%) 34 (5.4%) 26 (15.9%) < 0.001*
 Coronary heart disease 162 (20.6%) 121 (19.4%) 41 (25.0%) 0.114
 Cerebrovascular accident 172 (21.8%) 128 (20.5%) 44 (26.8%) 0.081
 Cancer 78 (9.9%) 65 (10.4%) 13 (7.9%) 0.342
 Dementia 35 (4.4%) 21 (3.4%) 14 (8.5%) 0.004*
 Liver and kidney disease 43 (5.5%) 35 (5.6%) 8 (4.9%) 0.714
 Thyroid disease 27 (3.4%) 18 (2.9%) 9 (5.5%) 0.103
 Varicose veins 46 (5.8%) 29 (4.7%) 17 (10.4%) 0.005*
Age-adjusted CCI 4.27 ± 1.44 4.17 ± 1.42 4.63 ± 1.44 < 0.001†
ASA class     0.001*
 1 26 (3.3%) 24 (3.8%) 2 (1.2%)  
 2 576 (73.1%) 470 (75.3%) 106 (64.6%)  
 3 180 (22.8%) 127 (20.4%) 53 (32.3%)  
 4 6 (0.8%) 3 (0.5%) 3 (1.8%)  
AO classification     0.008*
 A1 174 (22.1%) 145 (23.2%) 29 (17.7%)  
 A2 522 (66.2%) 417 (66.8%) 105 (64.0%)  
 A3 92 (11.7%) 62 (9.9%) 30 (18.3%)  
  1. Abbreviations: DVT Deep vein thrombosis, BMI Body mass index, COPD Chronic obstructive pulmonary disease, CCI Charlson Comorbidity Index, ASA American Society of Anaesthesiologists, AO Arbeitsgemeinschaft fur Osteosynthesefragen
  2. *Significant difference between two groups as shown by the Chi-square test; †Significant difference between two groups as shown by the Student t-test or the Mann–Whitney test. The values were given as the mean and standard deviation