Table 3.
Relationship of Patient, Oncologist, and Practice Group Variables to the Probability of Having the Multigene Test, Relative to a Standard Reference Patient with Other Variables Held Constant
| Variable | Variable Valuea | Probability of multigene testing, % | Difference in probability between the variable lowest- to highest-risk value |
|---|---|---|---|
| Age (years) | 70+ | 9% | 51% |
| 60–70 | 38% | ||
| 40–50 | 60% | ||
| Race/ethnicity | Black | 28% | 11% |
| Asian | 38% | ||
| White, non-Hispanic | 39% | ||
| Tumor size | >0.5 cm to <=1.0 cm | 15% | 26% |
| >2.0 cm | 38% | ||
| >1.0 cm to <=2.0 | 41% | ||
| Charlson comorbidity score | 3 | 33% | 8% |
| 1 | 38% | ||
| 0 | 41% | ||
| Community-level median family incomeb | 64,000 | 36% | 5% |
| 87,000 | 38% | ||
| 113,000 | 41% | ||
| Oncologist gender | Male | 38% | 12% |
| Female | 50% | ||
| Practice group oncology chief’s proportion of patients getting tested | 20% | 30% | 14% |
| 40% | 38% | ||
| 53% | 44% |
a
Values in bold represent the characteristics of the standard patient, who has an estimated probability of testing of 38% using the fitted multilevel regression model. Each probability estimate represents the effect of changing the value of a single variable while the other values in bold were held constant. Variable values were chosen to illustrate maximum range from lowest to highest probability of testing.
b
Community-level is from census block group characteristics.