Table 2.
The parameters of the two stages identified before and after PSM
| Before matching | After matching | |||||
|---|---|---|---|---|---|---|
| Learning stage (95 cases) | Proficiency stage (98 cases) | P value | Learning stage (89 cases) | Proficiency stage (94 cases) | P value | |
| OT (min) | 240 (75) | 200 (60) | < 0.001 | 241.22 (40.04) | 196.56 (11.44) | < 0.001 |
| Estimated amount of intraoperative blood loss (mL) | 20 (30) | 20 (0) | < 0.001 | 39.38 (29.96) | 23.16 (10.50) | 0.850 |
| Lymph node station dissection | 5 (2) | 6 (2) | < 0.001 | 4.72 (1.19) | 5.80 (0.53) | 0.032 |
| Amount of drainage on the day of surgery (mL) | 180 (125) | 232.61 ± 109.53 | 0.019 | 192.87 ± 25.73 | 238.57 (34.58) | 0.010 |
| Amount of drainage on the first postoperative day (mL) | 200 (125) | 205 (81) | 0.002 | 187.97 (32.07) | 223.42 (25.97) | < 0.001 |
| Average amount of drainage for 3 days after surgery (mL) | 169.68 ± 56.91 | 176 (72) | 0.355 | 168.50 (12.25) | 173.78 (30.56) | 0.091 |
| Postoperative tube time (day) | 4 (3) | 4 (2) | 0.052 | 4.74 (0.85) |
4.08 (0.40) |
0.133 |
| Length of hospital stay after surgery (day) | 7 (3) | 6 (2) | 0.008 | 7.31 (0.85) |
6.50 (0.60) |
0.085 |
| Number of intraoperative revolutions | 4 (4.2%) | 3 (3.1%) | 0.718 | 0 (0) | 0 (0.06) | 0.333 |
| Death rate (%) | 0 | 0 | NA | 0 | 0 | NA |