Table 1 Distribution characteristics of covariates in patients who received RBC transfusion or did not receive RBC transfusion before and after propensity score matching
Covariates | Before matching | After matching | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Nontransfusion | Transfusion | Nontransfusion | Transfusion | |||||||||
(N=360) | (N=209) | χ2 | P Value | (N=126) | (N=126) | χ2 | P Value | |||||
Gender | ||||||||||||
Male | 152 | 42.20% | 76 | 36.40% | 1.890 | 0.169 | 44 | 34.92% | 42 | 33.33% | 0.071 | 0.790 |
Female | 208 | 57.80% | 133 | 63.60% | 82 | 65.08% | 84 | 66.67% | ||||
Age-group(y) | ||||||||||||
≤60 | 87 | 24.20% | 76 | 36.40% | 12.121 | 0.002 | 32 | 25.40% | 35 | 27.78% | 3.400 | 0.183 |
60-70 | 62 | 17.20% | 21 | 10.00% | 22 | 17.46% | 12 | 9.52% | ||||
>70 | 211 | 58.60% | 112 | 53.60% | 72 | 57.14% | 79 | 62.70% | ||||
Drinking history | ||||||||||||
No | 289 | 80.30% | 172 | 82.30% | 0.350 | 0.554 | 110 | 87.30% | 105 | 83.33% | 0.792 | 0.374 |
Yes | 71 | 19.70% | 37 | 17.70% | 16 | 12.70% | 21 | 16.67% | ||||
Smoking history | ||||||||||||
No | 273 | 75.80% | 164 | 78.50% | 0.516 | 0.473 | 103 | 81.75% | 101 | 80.16% | 0.103 | 0.748 |
Yes | 87 | 24.20% | 45 | 21.50% | 23 | 18.25% | 25 | 19.84% | ||||
BMI (kg/m2) | ||||||||||||
≤18 | 47 | 13.10% | 43 | 20.60% | 5.711 | 0.058 | 23 | 18.25% | 24 | 19.05% | 1.262 | 0.532 |
18-25 | 245 | 68.10% | 132 | 63.20% | 87 | 69.05% | 80 | 63.49% | ||||
>25 | 68 | 18.90% | 34 | 16.30% | 16 | 12.70% | 22 | 17.46% | ||||
Pulmonary diseases | ||||||||||||
No | 308 | 85.60% | 167 | 79.90% | 3.062 | 0.080 | 101 | 80.15% | 102 | 80.95% | 0.025 | 0.874 |
Yes | 52 | 14.40% | 42 | 20.10% | 25 | 19.84% | 24 | 19.04% | ||||
Hyperlipemia | ||||||||||||
No | 348 | 96.70% | 206 | 98.60% | 1.856 | 0.853 | 122 | 96.83% | 124 | 98.41% | 0.171 | 0.679 |
Yes | 12 | 3.30% | 3 | 1.40% | 4 | 3.17% | 2 | 1.59% | ||||
Hypertension | ||||||||||||
No | 254 | 70.60% | 155 | 74.20% | 0.851 | 0.356 | 95 | 75.40% | 90 | 71.43% | 0.508 | 0.476 |
Yes | 106 | 29.40% | 54 | 25.80% | 31 | 24.60% | 36 | 28.57% | ||||
Coronary heart disease | ||||||||||||
No | 320 | 88.90% | 189 | 90.40% | 0.333 | 0.564 | 114 | 90.48% | 109 | 86.51% | 0.974 | 0.324 |
Yes | 40 | 11.10% | 20 | 9.60% | 12 | 9.52% | 17 | 13.49% | ||||
Diabetes | ||||||||||||
No | 296 | 82.20% | 172 | 82.30% | 0.001 | 0.982 | 106 | 84.13% | 104 | 82.54% | 0.114 | 0.735 |
Yes | 64 | 17.80% | 37 | 17.70% | 20 | 15.87% | 22 | 17.46% | ||||
Hepatic diseases | ||||||||||||
No | 292 | 81.10% | 182 | 87.10% | 3.389 | 0.066 | 111 | 88.10% | 103 | 81.75% | 1.983 | 0.159 |
Yes | 68 | 18.90% | 27 | 12.90% | 15 | 11.90% | 23 | 18.25% | ||||
Renal diseases | ||||||||||||
No | 307 | 85.30% | 178 | 85.60% | 0.009 | 0.923 | 107 | 84.92% | 104 | 82.54% | 0.262 | 0.609 |
Yes | 53 | 14.70% | 30 | 14.40% | 19 | 15.08% | 22 | 17.46% | ||||
Malignant tumor | ||||||||||||
No | 324 | 90.00% | 191 | 91.40% | 0.296 | 0.586 | 111 | 88.10% | 112 | 88.89% | 0.039 | 0.844 |
Yes | 36 | 10.00% | 18 | 8.60% | 15 | 11.90% | 14 | 11.11% | ||||
Hypoproteinemia | ||||||||||||
No | 348 | 96.67% | 181 | 86.60% | 22.056 | 0.000 | 117 | 92.86% | 117 | 92.86% | 0.000 | 1.000 |
Yes | 11 | 3.06% | 28 | 13.40% | 9 | 7.14% | 9 | 7.14% | ||||
Anemia | ||||||||||||
No | 244 | 67.80% | 63 | 30.10% | 75.385 | 0.000 | 55 | 43.65% | 56 | 44.44% | 0.016 | 0.899 |
Yes | 116 | 32.20% | 146 | 69.90% | 71 | 56.35% | 70 | 55.56% | ||||
ASA classification | ||||||||||||
≤2 | 94 | 26.10% | 35 | 16.70% | 6.615 | 0.010 | 26 | 20.63% | 27 | 21.43% | 0.024 | 0.877 |
>2 | 266 | 73.90% | 174 | 83.30% | 100 | 79.37% | 99 | 78.57% | ||||
Operative time(h) | ||||||||||||
≤2 | 275 | 76.40% | 83 | 39.70% | 76.236 | 0.000 | 72 | 57.14% | 70 | 55.56% | 0.065 | 0.799 |
>2 | 85 | 23.60% | 126 | 60.30% | 54 | 42.86% | 56 | 44.45% | ||||
Time from trauma to surgery(d) | ||||||||||||
<4 | 193 | 53.60% | 85 | 40.70% | 8.863 | 0.003 | 61 | 48.41% | 65 | 51.59% | 0.254 | 0.614 |
>4 | 167 | 46.40% | 124 | 59.30% | 65 | 51.59% | 61 | 48.41% | ||||
Tranexamic acid | ||||||||||||
No | 100 | 27.80% | 77 | 36.80% | 5.070 | 0.024 | 41 | 32.54% | 44 | 34.92% | 0.160 | 0.689 |
Yes | 260 | 72.20% | 132 | 63.20% | 85 | 67.46% | 82 | 65.08% | ||||
Anticoagulation | ||||||||||||
No | 10 | 2.80% | 9 | 4.30% | 0.957 | 0.328 | 3 | 2.38% | 3 | 2.38% | 0.000 | 1.000 |
Yes | 350 | 97.20% | 200 | 95.70% | 123 | 97.62% | 123 | 97.62% | ||||