Table 1 Univariate analysis of Demographics, Comorbidities and Surgical Factors in relation to presence of DVT after TKR
Characteristic | Â | Presence of DVT | Odds Ratio (95% Confidence Interval) | P-Value | Adjusted Odds Ratio (95% Confidence Interval) | P-value | |
|---|---|---|---|---|---|---|---|
| Â | Total | Yes | No | Â | Â | Â | Â |
Demographic Variables | |||||||
Sex |  |  |  | 1.77(0.91–1.86) | 0.184 |  |  |
 Male | 725 | 41 (5.7) | 684 (94.3) |  |  |  |  |
 Female | 2073 | 150 (7.1) | 1926 (92.9) |  |  |  |  |
Age (years) | Â | Â | Â | Â | 0.671 | Â | Â |
 Median (range) |  | 66.06 (40) | 65.78 (58) |  |  |  |  |
 Minimum and maximum | 31 and 90 |  |  |  |  |  |  |
Ethnicity |  |  |  | 7.81 (7.21–8.456) | 0.05 | 1.095 (0.89–1.349) | 0.39 |
 Chinese | 2009 (72.7) | 137 (6.8) | 1872 (93.2) |  |  |  |  |
 Malay | 360 (11.8) | 18 (5.0) | 342 (95.09) |  |  |  |  |
 Indian | 394 (14.5) | 27 (6.9) | 367 (93.1) |  |  |  |  |
 Others | 35 (1.0) | 6 (82.9) | 29 (17.1) |  |  |  |  |
BMI |  |  |  | 2.003 (1.783–2.412) | 0.55 | 1.003 (0.973–1.035) | 0.84 |
 Median (range) |  | 27.95 (28.63) | 27.71 (52.46) |  |  |  |  |
 Interquartile Range |  | 5.45 | 5.92 |  |  |  |  |
Comorbidities | |||||||
Hypertension |  |  |  | 1.1.1.1.1 0.70 (0.60–1.09) | 0.13 | 0.859 (0.602–1.224) | 0.40 |
 Y |  | 111 (7.0) | 1392 (93.0) |  |  |  |  |
 N |  | 80 (6.2) | 1218 (93.8) |  |  |  |  |
Ischemic Heart Disease |  |  |  | 1.1.1.1.1 1.00 (0.62–1.66) | 0.99 | 1.000 (0.549–1.837) | 0.99 |
 Y |  | 19 (6.7) | 263 (93.3) |  |  |  |  |
 N |  | 172 (6.8) | 2347 (93.2) |  |  |  |  |
Diabetes Mellitus |  |  |  | 1.1.1.1.1 1.00 (0.69–1.48) | 0.96 | 1.215 (0.78–1.893) | 0.388 |
 Y |  | 34 (6.8) | 468 (93.2) |  |  |  |  |
 N |  | 157 (5.8) | 2539 (94.2) |  |  |  |  |
Cancer |  |  |  | 0.65 (0.33–1.62) | 0.42 |  |  |
 Y |  | 7 (8.9) | 71 (91.1) |  |  |  |  |
 N |  | 184 (8.3) | 2036 (91.7) |  |  |  |  |
Smoking |  |  |  | 0.06 (0.29–5.01) | 0.81 | 1.29 (0.261–6.377) | 0.755 |
 Y |  | 2 (5.7) | 33 (94.3) |  |  |  |  |
 N |  | 189 (6.8) | 2577 (93.2) |  |  |  |  |
Consumption of Anti-Platelet Drugs |  |  |  | 0.56 (0.47–1.45) | 0.45 | 0.834 (0.400–1.738) | 0.628 |
 Y |  | 14 (8.1) | 159 (91.9) |  |  |  |  |
 N |  | 177 (6.7) | 2451 (93.3) |  |  |  |  |
Consumption of NSAIDs |  |  |  | 0.88 (0.72–2.00) | 0.54 | 1.297 (0.697–2.415) | 0.412 |
 Y |  | 17 (5.7) | 273 (94.3) |  |  |  |  |
 N |  | 174 (6.9) | 2337 (93.1) |  |  |  |  |
Previous Lower Limb VTE |  |  |  | 9.85 (1.23–10.98) | 0.00 |  |  |
 Y |  | 5 (24.0) | 16 (76.0) |  |  |  |  |
 N |  | 187 (6.7) | 2592 (93.3) |  |  |  |  |
Family History of VTE |  |  |  | 1.1.1.1.1 1.41 (0.02–1.66) | 0.24 | 3.777 (0.063–22.518) | 0.525 |
 Y |  | 1 (25.0) | 4 (75.0) |  |  |  |  |
 N |  | 190 (6.8) | 2606 (93.2) |  |  |  |  |
Surgical Factors | |||||||
Length of Stay |  | Y | N |  |  | 1.152 (1.110–1.194) | 0.000 |
 Median (range) |  | 9.33 (60) | 6.42 (28) |  |  |  |  |
 Interquartile Range |  | 5 | 2 |  |  |  |  |
Operation Time (minutes) |  |  |  | 2.000 (0.954–3.025) | 0.55 | 1.000 (0.996–1.005) | 0.889 |
 Median (range) |  | 121 (213) | 119 (353) |  |  |  |  |
 Interquartile Range |  | 43 | 28 |  |  |  |  |