Table 2.
Adjusted associations with high surgical volume for colorectal cancer.
| Physician characteristics | Adjusted odds ratio (95% confidence interval) | P value* |
|---|---|---|
| Specialty | ||
| General surgeon | Reference | -- |
| Surgical oncologist/colorectal surgeon | 4.92 (2.94, 8.20) | <0.001 |
| Year of medical school graduation | ||
| 1952-1973 | Reference | -- |
| 1974-1981 | 1.29 (0.67, 2.47) | .44 |
| 1982-1990 | 1.45 (0.75, 2.81) | .27 |
| 1991-2001 | 1.32 (0.67, 2.62) | .42 |
| Board certification | ||
| No | Reference | -- |
| Yes | 0.80 (0.33, 1.90) | .61 |
| Teaching | ||
| None | Reference | -- |
| 1 or more days per month | 0.95 (0.59, 1.54) | .84 |
| Practice setting | ||
| Hospital | Reference | -- |
| Solo, office based | 0.53 (0.23, 1.21) | .13 |
| Single specialty group, office based | 1.51 (0.86, 2.66) | .16 |
| Multispecialty group, office based | 1.31 (0.61, 2.79) | .48 |
| Office based, other | 0.39 (0.05, 3.37) | .38 |
| Practice at National Cancer Institute-designated Cancer Center | ||
| No | Reference | -- |
| Yes | 1.58 (0.99, 2.52) | .06 |
| Practice part of Community Clinical Oncology Program | ||
| No | Reference | -- |
| Yes | 1.10 (0.69, 1.77) | .68 |
| Attend tumor board meetings | ||
| Weekly | 1.62 (0.93, 2.82) 1.00 | .09 |
| Monthly | (0.57, 1.75) | .99 |
| Quarterly or less frequently | Reference | -- |
| Study site | ||
| Los Angeles County | Reference | -- |
| 5 Health maintenance organizations | 0.62 (0.26, 1.44) | .26 |
| 8 Northern California counties | 0.82 (0.45, 1.49) | .51 |
| State of Alabama | 0.62 (0.31, 1.25) | .18 |
| 22 North Carolina counties | 0.45 (0.23, 0.88) | .02 |
| 10 Veterans Affairs hospitals | 1.35 (0.50, 3.60) | .55 |
*
Using logistic regression. Model included characteristics with bivariate association ≥.20, in table.