Table 3.
Characteristics of the matched study population in the SA-2
| Surgery [MIE] | CCRT | Standardized differencea | ||||
|---|---|---|---|---|---|---|
| Number or mean (sd)a | (%)a | Number or mean (sd)a | (%)a | |||
| Age | 56.38 (8.21) | 55.35 (10.58) | 0.11 | |||
| Gender | Female | 4 | (5) | 4 | (5) | 0.00 |
| Male | 78 | (95) | 78 | (95) | ||
| Residency | Non-north | 57 | (70) | 52 | (63) | 0.13 |
| North | 25 | (30) | 30 | (37) | ||
| Tumor size | ≤ 5 cm | 31 | (38) | 31 | (38) | 0.00 |
| > 5 cm | 51 | (62) | 51 | (62) | ||
| Differentiation | Poorly/undifferentiated | 31 | (38) | 30 | (37) | 0.03 |
| Well/moderately | 51 | (62) | 52 | (63) | ||
| RT delivery | Non-IGRT | 70 | (85) | 68 | (83) | 0.07 |
| IGRT | 12 | (15) | 14 | (17) | ||
| Institution | Low volume | 23 | (28) | 25 | (30) | 0.05 |
| High volume | 59 | (72) | 57 | (70) | ||
| Use of PET | Without | 7 | (9) | 11 | (13) | 0.16 |
| With | 75 | (91) | 71 | (87) |
The nonoverlapped covariable (location) was not included in this matching
sd standard deviation, RT radiotherapy, IGRT image-guided RT, PET positron emission tomography, MIE minimally invasive esophagectomy, CCRT concurrent chemoradiotherapy
aRounded