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Table 1 Univariate analysis of demographic and comorbidity variables for deep vein thrombosis, pulmonary embolism, and all-cause venous thromboembolic disease

From: Unicompartmental knee arthroplasty and revision total knee arthroplasty have a lower risk of venous thromboembolism disease at 30 days than primary total knee arthroplasty

  DVT PE VTED
N (%) P value N (%) P value N (%) P value
Age (years)
 18–54 (N = 23,636) 192 (0.8%) < 0.001a 103 (0.4%) < 0.001 274 (1.2%) < 0.001
 55–75 (N = 143,972) 1182 (0.8%) 815 (0.6%) 1858 (1.3%)
  > 75 (N = 45,626) 471 (1.0%) 323 (0.7%) 722 (1.6%)
Body mass index (kg/m2)
  < 25 (N = 21,699) 189 (0.9%) 0.101 75 (0.3%) < 0.001 244 (1.1%) 0.023
 25–34.99 (N = 119,669) 1083 (0.9%) 681 (0.6%) 1638 (1.4%)
 35–44.99 (N = 60,374) 485 (0.8%) 419 (0.7%) 828 (1.4%)
 45+ (N = 11,492) 88 (0.8%) 66 (0.6%) 144 (1.3%)
Sex
 Male (N = 82,759) 743 (0.9%) 0.203 421 (0.5%) < 0.001 1090 (1.3%) 0.498
 Female (N = 130,475) 1102 (0.8%) 820 (0.6%) 1764 (1.4%)
 History of smoking (N = 18,142) 160 (0.9%) 0.806 897 (0.5%) 0.062 229 (1.3%) 0.362
 History of diabetes mellitus (N = 37,948) 289 (0.8%) 0.016 224 (0.6%) 0.826 486 (1.3%) 0.290
Anesthesia type
 Regional (N = 107,001) 862 (0.8%) 0.003 641 (0.6%) 0.319 1387 (1.3%) 0.083
 General (N = 105,931) 982 (0.9%) 599 (0.6%) 1465 (1.3%)
ASA class
 Class 1 (N = 4231) 40 (0.9%) 0.337 14 (0.3%) 0.075 51 (1.2%) 0.097
 Class 2 (N = 106,509) 884 (0.8%) 600 (0.6%) 1366 (1.3%)
 Class 3 (N = 99,006) 892 (0.9%) 607 (0.6%) 1390 (1.4%)
 Class 4 (N = 3488) 29 (0.8%) 20 (0.6%) 47 (1.3%)
Operative time (hours)
  < 2 (N = 172,154) 1467 (0.9%) 0.406 992 (0.6%) 0.066 2270 (1.3%) 0.117
 2–4 (N = 33,384) 308 (0.9%) 189 (0.6%) 463 (1.4%)
  > 4 (N = 7696) 70 (0.9%) 60 (0.8%) 121 (1.6%)
Arthroplasty type
 Primary total Knee arthroplasty (N = 191,810) 1706 (0.9%) < 0.001 1169 (0.6%) < 0.001 2655 (1.4%) < 0.001
 Unicompartmental knee arthroplasty (N = 9294) 36 (0.4%) 22 (0.2%) 52 (0.6%)
 Revision total knee arthroplasty (N = 12,130) 103 (0.8%) 50 (0.4%) 147 (1.2%)
  1. aBold type signifies statistical significance, P < 0.05