Table 2. Cox Proportional Hazards Model of Prescriber Conversiona.
| Variable | HR (95% CI) | P value |
|---|---|---|
| Clinician role (vs advanced practice practitioner) | ||
| Attending physician | 0.62 (0.43-0.90) | .01 |
| Resident physician | 0.52 (0.35-0.78) | .001 |
| Intervention site status (vs usual care) | 1.50 (1.04-2.18) | .03 |
| Academic site status (vs nonacademic) | 3.15 (2.16-4.60) | <.001 |
| Health care system (vs system 1) | ||
| 2 | 3.21 (1.53-6.72) | .003 |
| 3 | 31.50 (15.30-64.50) | <.001 |
| 4 | 5.50 (3.00-10.10) | <.001 |
| 5 | 13.30 (7.32-24.00) | <.001 |
Abbreviation: HR, hazard ratio.
a
HRs were calculated with exposure term fit with penalized cubic spline with 2 df. See Figure 2 for values and 95% CIs.