Table 3.
Propensity scoring baseline comparison
| Variable | Age group | p value | |
|---|---|---|---|
| 70–79 | 80+ | ||
| Male | 209 (72.6 %) | 202 (70.1 %) | 0.05a |
| Race | |||
| Black | 9 (3.1 %) | 11 (3.8 %) | 0.20b |
| Other | 24 (8.7 %) | 28 (9.7 %) | |
| White | 254 (88.2 %) | 249 (86.5 %) | |
| SOI | |||
| 2 | 12 (4.2 %) | 15 (5.2 %) | 0.10b |
| 3 | 193 (67.0 %) | 191 (66.3 %) | |
| 4 | 83 (28.8 %) | 82 (28.5 %) | |
| ILE | 195 (67.7 %) | 192 (66.7 %) | 0.37a |
| Center volume | |||
| LSTV | 76 (26.4 %) | 76 (26.4 %) | 0.65b |
| LV | 59 (20.5 %) | 63 (21.9 %) | |
| MV | 79 (27.4 %) | 78 (27.1 %) | |
| HV | 74 (25.7 %) | 71 (24.7 %) | |
| Surgeon volume | |||
| LSTV | 82 (28.5 %) | 79 (27.4 %) | 0.61b |
| LV | 79 (27.4 %) | 80 (27.8 %) | |
| MV | 69 (24.0 %) | 67 (23.3 %) | |
| HV | 58 (20.1 %) | 62(21.5 %) | |
a
McNemar test
b
Symmetry test, SOI severity of illness, ILE Ivor-Lewis esophagectomy, LSTV lowest volume center, LV low volume center, MV medium volume center, HV high volume center