Table 3.
Short-term outcomes before and after PSM
| Characteristics | Before PSM | After PSM | ||||
|---|---|---|---|---|---|---|
| Hypokalemia (390) | Normal (5793) | P value | Hypokalemia (390) | Normal (390) | P value | |
| Operation time (min) | 217.7 ± 79.3 | 221.0 ± 79.4 | 0.432 | 217.7 ± 79.3 | 217.8 ± 87.0 | 0.985 |
| Blood loss (mL) | 111.7 ± 273.3 | 96.5 ± 131.5 | 0.044* | 111.7 ± 273.3 | 91.0 ± 96.3 | 0.158 |
| Hospital stay (day) | 12.8 ± 12.3 | 11.2 ± 7.7 | < 0.01* | 12.8 ± 12.3 | 11.2 ± 6.2 | 0.028* |
| Overall complications | 111 (28.5%) | 1228 (21.2%) | 0.001* | 111 (27.8%) | 87 (22.3%) | 0.048* |
| Anastomotic leakage | 12 (3.1%) | 144 (2.5%) | 0.471 | 111 (28.5%) | 5 (1.3%) | 0.086 |
| Incision infection | 17 (4.4%) | 198 (3.4%) | 0.326 | 12 (3.1%) | 12 (3.1%) | 0.344 |
| Pneumonia | 27 (6.9%) | 187 (3.2%) | < 0.01* | 17 (4.4%) | 11 (2.8%) | 0.008* |
| Lymph fistula | 6 (1.5%) | 37 (0.6%) | 0.051 | 27 (6.9%) | 4 (1.0%) | 0.524 |
| Ileus | 5 (1.3%) | 117 (2.0%) | 0.311 | 6 (1.5%) | 10 (2.7%) | 0.192 |
| VTE | 6 (1.5%) | 52 (0.9%) | 0.197 | 5 (1.3%) | 2 (0.5%) | 0.155 |
| Reoperation | 10 (2.3%) | 95 (1.6%) | 0.172 | 6 (1.5%) | 3 (0.8%) | 0.050 |
| Postoperative death | 7 (1.8%) | 16 (0.3%) | < 0.01* | 10 (2.3%) | 3 (0.8%) | 0.203 |
| Other complications | 45 (11.5%) | 565 (9.8%) | 0.252 | 7 (1.8%) | 46 (11.8%) | 0.911 |
Note: Variables are expressed as the mean ± SD, n (%), *P-value < 0.05
Abbreviations: PSM Propensity score matching, VTE Venous thromboembolism