Table 4.
Adjusted associations of surgeons’ colorectal cancer volume with collaborative care for decisions regarding chemotherapy
| Physician characteristics | Adjusted odds ratio (95% confidence interval) | P value* |
|---|---|---|
| Surgeon volume (Number of colorectal cancer resections/month) | ||
| 0-1 | Reference | -- |
| 2 | 1.63 (1.01, 2.63) | .04 |
| 3-4 | 2.39 (1.46, 3.91) | <0.001 |
| ≥5 | 3.48 (1.94, 6.24) | <0.001 |
| Specialty | ||
| General surgeon | Reference | -- |
| Colorectal surgeon/Surgical Oncologist | 1.87 (1.05, 3.31) | .03 |
| US or Canadian medical graduate | ||
| No | Reference | -- |
| Yes | 2.02 (1.15, 3.52) | .01 |
| Practice site | ||
| Hospital | Reference | -- |
| Solo, office based | 1.39 (0.80, 2.44) | .25 |
| Single specialty group, office based | 0.63 (0.39, 1.03) | .06 |
| Multi- specialty group, office based | 0.55 (0.29, 1.03) | .06 |
| Office based, Other/unknown | 0.95 (0.35, 2.60) | .92 |
| % patients in managed care | ||
| 0-30 | Reference | -- |
| 31-50 | 0.53 (0.29, 0.99) | .04 |
| 55-85 | 0.55 (0.31, 0.97) | .04 |
| 87-100 | 0.50 (0.27, 0.90) | .02 |
| Practice at National Cancer Institute-designated Cancer Center | ||
| No | Reference | -- |
| Yes | 1.13 (0.74, 1.71) | .58 |
| Practice part of Community Clinical Oncology Program | ||
| No | Reference | -- |
| Yes | 1.68 (1.13, 2.51) | .01 |
| Attend tumor board meetings | ||
| Weekly | 1.66 (1.06, 2.60) | .02 |
| Monthly | 1.66 (1.08, 2.54) | .03 |
| Quarterly or less frequently | Reference | -- |
| Study site | ||
| Los Angeles County | Reference | -- |
| 5 Health maintenance organizations | 2.29 (1.08, 4.86) | .03 |
| 8 Northern California counties | 1.09 (0.67, 1.79) | .73 |
| State of Alabama | 1.61 (0.88, 2.94) | .12 |
| 22 North Carolina counties | 1.39 (0.79, 2.43) | .25 |
| 10 Veterans Affairs hospitals | 1.17 (0.44, 3.12) | .76 |
*
Using logistic regression. Model included characteristics with bivariate association ≤.20, in table.