Table 2.
Characteristics of the open surgery and minimally invasive esophagectomy groups
| Open surgery (n = 324) | MIE (n = 123) | P value | |
| Age (yr) | 60.3 ± 7.8 | 60.1 ± 6.3 | 0.7821 |
| Gender | 0.0552 | ||
| Male | 226 | 97 | |
| Female | 98 | 26 | |
| ASA grade | 0.8202 | ||
| I | 15 | 6 | |
| II | 248 | 97 | |
| III | 61 | 20 | |
| Height (cm) | 170.2 ± 4.8 | 171.1 ± 4.9 | 0.5851 |
| Weight (kg) | 65.2 ± 9.8 | 66.8 ± 8.1 | 0.1521 |
| Smoker | 0.9122 | ||
| Never | 123 | 46 | |
| Current or former | 201 | 77 | |
| pT stage | |||
| Tis | 3 | 4 | 0.077 |
| T1 | 20 | 36 | < 0.001 |
| T2 | 46 | 72 | < 0.001 |
| T3 | 225 | 11 | < 0.001 |
| T4 | 30 | 0 | < 0.001 |
| Resection rate | 0.4792 | ||
| R0 | 313 | 121 | |
| R1 | 6 | 2 | |
| R2 | 5 | 0 | |
| Inductive chemo/radio therapy | 40% | 14% | 0.7882 |
| pTis/T1/T2 | 0 | 0 | |
| pT3 | 15 | 6 | 0.9122 |
| pT4 | 25 | 0 | 0.002 |
| LNM rate | |||
| pTis | 0 | 0/4 | |
| pT1 | 6 (30) | 10/36, 27.8% | 0.8602 |
| pT2 | 20 (43.4) | 29/72, 40.3% | 0.7312 |
| pT3 | 125 (55.6) | 5/11, 45.5% | 0.5112 |
| pT4 | 22 (73.3) | 0 | |
| Surgical approach | < 0.001 | ||
| Macheen | 225 | 123 | |
| Ivor-Lewis | 99 | 0 |
1
The t test;
2
Fisher's exact test. LNM rate = number of patients with positive lymph nodes/number of total patients. LNM: Lymph node metastatic; MIE: Minimally invasive esophagectomy; ASA: American Society of Anesthesiologists.