Table 1.
Patient Demographic and Clinical Characteristics Stratified by Hospital RAMP Outlier Status
| Demographic or Clinical Characteristic | Hospital RAMP Outlier Status (% of patients) |
P | ||
|---|---|---|---|---|
| High Outlier (n = 1,797) | Nonoutlier (n = 29,585) | Low Outlier (n = 972) | ||
| No. of hospitals | 66 | 1,274 | 9 | |
| Age, years | < .001 | |||
| Mean | 64.0 | 64.0 | 61.1 | |
| SD | 13.2 | 13.2 | 13.4 | |
| Age at diagnosis, years | < .001 | |||
| 18-49 | 14.5 | 14.4 | 21.1 | |
| 50-64 | 35.1 | 35.9 | 36.2 | |
| 65-74 | 26.2 | 25.1 | 25.6 | |
| 75-90 | 24.2 | 24.6 | 17.1 | |
| Male sex | 57.0 | 56.6 | 57.0 | .93 |
| Race | .02 | |||
| White | 86.9 | 87.3 | 87.8 | |
| Black | 8.9 | 7.4 | 6.3 | |
| Other | 4.2 | 5.2 | 6.0 | |
| Insurance status | < .001 | |||
| Uninsured | 4.1 | 2.8 | 3.8 | |
| Private | 11.9 | 13.5 | 10.1 | |
| Medicaid | 3.7 | 3.7 | 3.9 | |
| Medicare | 46.0 | 44.9 | 33.4 | |
| Other | 31.2 | 33.2 | 34.5 | |
| Missing | 3.1 | 1.9 | 14.3 | |
| Income* | < .001 | |||
| ≥ $46,000 | 31.2 | 36.7 | 48.5 | |
| Missing | 6.4 | 5.5 | 1.5 | |
| Education* | < .001 | |||
| ≥ 29% | 19.2 | 16.3 | 13.2 | |
| Missing | 6.4 | 5.5 | 1.5 | |
| Rurality | < .001 | |||
| Metropolitan | 76.4 | 76.0 | 84.3 | |
| Suburban | 16.6 | 15.6 | 13.2 | |
| Rural | 1.3 | 2.3 | 1.6 | |
| Missing | 5.7 | 6.2 | 0.9 | |
| Tumor location | < .001 | |||
| Rectosigmoid | 38.2 | 37.9 | 31.7 | |
| Rectum | 61.8 | 62.1 | 68.3 | |
| AJCC stage, sixth edition | .26 | |||
| I | 29.0 | 31.3 | 33.7 | |
| IIA | 27.2 | 26.7 | 25.1 | |
| IIB | 2.6 | 2.4 | 2.3 | |
| IIIA | 7.1 | 7.2 | 8.1 | |
| IIIB | 17.4 | 17.4 | 16.8 | |
| IIIC | 16.8 | 14.9 | 14.0 | |
| Tumor size, mm | .02 | |||
| ≤ 10 | 3.4 | 3.9 | 4.7 | |
| 11-20 | 9.3 | 10.0 | 10.3 | |
| > 20 | 73.0 | 71.3 | 66.7 | |
| Missing | 14.2 | 14.8 | 18.3 | |
| Histology | .44 | |||
| Adenocarcinoma | 91.8 | 91.9 | 90.5 | |
| Signet ring | 0.7 | 0.7 | 0.6 | |
| Mucinous | 7.5 | 7.3 | 8.8 | |
| Tumor grade | < .001 | |||
| Well/moderately differentiated | 81.1 | 80.9 | 72.0 | |
| Poorly/undifferentiated | 13.7 | 13.7 | 22.3 | |
| Missing | 5.2 | 5.4 | 5.7 | |
| Comorbidity score | .006 | |||
| 0 | 81.6 | 78.4 | 80.2 | |
| 1 | 14.9 | 17.5 | 15.0 | |
| ≥ 2 | 3.5 | 4.1 | 4.7 | |
NOTE. Column percentages may not add up to 100% because of rounding.
Abbreviations: RAMP, risk-adjusted margin positivity rate; SD, standard deviation.
*
Based on 2000 census data. For income, the percentage of patients whose area of residence (based on year 2000 census data) had a median household income ≥ $46,000 is presented. For education, the percentage of patients whose area of residence (based on year 2000 Census data) had ≥ 29% of adults who did not attain a high school education is presented.