Table 1. Demographic feature of the patients in the three groups according to the AAOS guideline.
| Variables | Total n = 328 (100%) |
Standard risk n = 282 (86.0%) |
High PE risk n = 32 (9.8%) |
Highbleedingrisk n = 14 (4.3%) |
P value |
|---|---|---|---|---|---|
| Female (%) | 299 (91.2) | 254 (90.1) | 32 (100.0) | 13 (92.9) | 0.168 |
| Age (yr) | 69.2 ± 6.3 | 69.2 ± 6.4 | 69.3 ± 6.3 | 69.8 ± 4.7 | 0.951 |
| Height (cm) | 152.6 ± 6.8 | 152.8 ± 7.0 | 149.7 ± 5.1 | 154.8 ± 6.8 | 0.024* |
| Weight (kg) | 63.4 ± 10.0 | 62.9 ± 9.8 | 66.3 ± 12.5 | 67.0 ± 8.3 | 0.075 |
| BMI (kg/m2) | 27.2 ± 3.6 | 26.9 ± 3.5 | 29.5 ± 4.8 | 27.9 ± 2.9 | 0.001† |
| Operation type (%) | 0.030‡ | ||||
| Unilateral TKA | 169 (51.5) | 144 (85.2) | 18 (10.7) | 7 (4.1) | |
| Simultaneous bilateral TKA | 99 (30.2) | 92 (92.9) | 6 (6.1) | 1 (1.0) | |
| Staged bilateral TKA | 60 (18.3) | 46 (76.7) | 8 (13.3) | 6 (10.0) |
Data of age, height, weight, and BMI are presented as mean value±standard deviation. *The patients with high risk for PE have short stature than patients of other groups; †The patients with high risk for PE have greater BMI than patients of other groups; ‡There were more patients with standard risks for pulmonary embolism and bleeding in the simultaneous bilateral TKA group than unilateral or staged bilateral TKA groups. AAOS, American Academy of Orthopaedic Surgeons; PE, pulmonary embolism; BMI, Body Mass Index; TKA, total knee arthroplasty.