Table 1.
Baseline characteristics before and after propensity-score matching.
| Before PSM | After PSM | ||||||
|---|---|---|---|---|---|---|---|
| n (%)/mean (SD) | n (%)/mean (SD) | ||||||
| Variable | nICT group (n=195) | nCT group (n=537) | P | nICT group (n=195) | nCT group (n =390) | P | SMD |
| Age (year) | 62.13 (9.95) | 61.71 (10.10) | 0.611 | 62.13 (9.95) | 62.27 (9.73) | 0.872 | 0.014 |
| Sex | 0.690 | 0.810 | 0.030 | ||||
| Male | 147 (75.39) | 397 (73.93) | 147 (75.39) | 299 (76.67) | |||
| Female | 48 (24.61) | 140 (26.07) | 48 (24.61) | 91 (23.33) | |||
| BMI (kg/m2) | 22.01 (3.18) | 21.61 (3.04) | 0.127 | 22.01 (3.18) | 21.93 (3.08) | 0.756 | 0.027 |
| History of abdominal surgery | 0.983 | 0.969 | 0.014 | ||||
| Yes | 34 (17.44) | 94 (17.50) | 34 (17.44) | 66 (16.92) | |||
| No | 161 (82.56) | 443 (82.50) | 161 (82.56) | 324 (83.08) | |||
| aCCI score | 0.345 | 0.608 | 0.053 | ||||
| <5 | 77 (39.49) | 192 (35.75) | 77 (39.49) | 144 (36.92) | |||
| ≥5 | 118 (60.51) | 345 (64.25) | 118 (60.51) | 246 (63.08) | |||
| ASA Grade | 0.954 | 0.876 | 0.045 | ||||
| I | 14 (7.18) | 36 (6.70) | 14 (7.18) | 25 (6.41) | |||
| II | 152 (77.45) | 424 (78.96) | 152 (77.45) | 311 (79.74) | |||
| III | 29 (14.87) | 77 (14.34) | 29 (14.87) | 54 (13.85) | |||
| Tumour size (cm) | 0.037 | 0.578 | 0.056 | ||||
| <5 | 96 (49.23) | 218 (40.60) | 96 (49.23) | 181 (46.41) | |||
| ≥5 | 99 (50.77) | 319 (59.40) | 99 (50.77) | 209 (53.59) | |||
| cT | 0.468 | 0.938 | 0.032 | ||||
| T3 | 28 (14.36) | 67 (12.48) | 28 (14.36) | 56 (14.36) | |||
| T4a | 144 (78.85) | 389 (72.44) | 144 (78.85) | 284 (72.82) | |||
| T4b | 23 (11.79) | 81 (15.08) | 23 (11.79) | 50 (12.82) | |||
| cN | 0.271 | 1.000 | 0.012 | ||||
| N0 | 10 (5.13) | 40 (7.45) | 10 (5.13) | 19 (4.87) | |||
| N+ | 185 (94.87) | 497 (92.55) | 185 (94.87) | 371 (95.13) | |||
| Clinical stage TNM | 0.509 | 0.931 | 0.033 | ||||
| II | 23 (11.79) | 65 (12.11) | 23 (11.79) | 44 (11.28) | |||
| III | 149 (76.42) | 391 (72.81) | 149 (76.42) | 296 (75.90) | |||
| IVA | 23 (11.79) | 81 (15.08) | 23 (11.79) | 50 (12.82) | |||
| Surgical type | 0.068 | 0.793 | 0.033 | ||||
| Distal | 38 (19.49) | 75 (13.97) | 38 (19.49) | 71 (18.21) | |||
| Total | 157 (80.51) | 462 (86.03) | 157 (80.51) | 319 (81.79) | |||
aCCI, age-adjusted Charlson Comorbidity Index; ASA, American Society of Anesthesiologists; nCT, neoadjuvant chemotherapy; nICT, neoadjuvant chemotherapy combined with immunotherapy; PSM, propensity-score matching; SMD, standardized mean difference.