Table 1.
Baseline characteristics by group both before and after propensity matching.
| Before Propensity Match | After Propensity Match | |||||||
|---|---|---|---|---|---|---|---|---|
| Variable | Chemotherapy/ Radiation |
Surgery | Standardized Difference (%) |
p-value | Chemotherapy/ Radiation |
Surgery | Standardized Difference (%) |
p-value |
| N | 1215 (84%) | 231 (16%) | 231 (50%) | 231 (50%) | ||||
| Age | 67 (57, 77) | 68 (57, 80) | −7.4 | 0.27 | 69 (58, 77.5) | 68 (57, 80) | 1.5 | 0.74 |
| Female | 529 (44%) | 117 (51%) | −14.3 | 0.06 | 113 (48.9%) | 117 (50.6%) | −3.5 | 0.78 |
| White Race | 987 (81%) | 192 (83%) | −4.9 | 0.56 | 190 (82.3%) | 192 (83.1%) | −2.3 | 0.90 |
| Private Insurance | 369 (30%) | 88 (38%) | −16.3 | 0.03 | 94 (40.7%) | 88 (38.1%) | 5.3 | 0.63 |
| Charlson/Deyo Comorbidity Index | 0.45 | 0.53 | ||||||
| 0 | 944 (78%) | 171 (74%) | 8.6 | 181 (78.4%) | 171 (74.0%) | 10.2 | ||
| 1 | 212 (17%) | 48 (21%) | −8.5 | 39 (16.9%) | 48 (20.8%) | −10.0 | ||
| 2 | 59 (4.9%) | 12 (5.2%) | −1.6 | 11 (4.8%) | 12 (5.2%) | −2.0 | ||
| Academic Center Status | 380 (31%) | 75 (33%) | −2.6 | 0.78 | 79 (34.2%) | 75 (32.5%) | 3.7 | 0.77 |
| Tumor Location (Rectal vs Colon) | 567 (46.7%) | 19 (8.2%) | 95.5 | <0.01 | 19 (8.2%) | 19 (8.2%) | 0.0 | 0.99 |
*
Continuous variables are presented as median (interquartile range) while categorical variables are presented as frequency (percentage).