Table 2 Clinical outcomes of the high preoperative WBC count group and the low preoperative WBC count group before and after IPTW. WBC, white blood cell; IPTW, inverse probability of treatment weighting
| Â | Before IPTW | After IPTW | ||||
|---|---|---|---|---|---|---|
Low pre-WBC count n = 6236 | High pre-WBC count n = 1885 | P value | Low pre-WBC count n = 6235.3 | High pre-WBC count n = 1889.2 | P value | |
Re-operation with in 30 days | Â | Â | 0.860 | Â | Â | 0.829 |
 Yes | 113[1.8] | 33[1.8] |  | 113.493[1.8] | 32.959[1.7] |  |
 No | 6123[98.2] | 1852[98.2] |  | 6121.825[98.2] | 1856.220[98.3] |  |
 Number of days in hospital(days) | 18.25 ± 0.29 | 18.10 ± 0.17 |  | 18.27 ± 0.30 | 18.17 ± 0.16 | 0.86 |
 Intraoperative bleeding(mL) | 74.81 ± 1.09 | 79.05 ± 1.65 |  | 75.03 ± 1.11 | 78.02 ± 1.61 | 0.17 |