Adjusted logistic regression—with clustering (random effect for physician)
| Independent variable | OR | 95% CI | P value |
| Intervention | 1.36 | (1.10 to 1.68) | 0.005 |
| Male sex | 0.91 | (0.73 to 1.14) | 0.42 |
| Patient age | 1.00 | (0.99 to 1.01) | 0.99 |
| Insurance | |||
| Private (ref.) | |||
| Medicare | 1.30 | (1.01 to 1.69) | 0.05 |
| Medicaid | 1.30 | (1.01 to 1.65) | 0.04 |
| Other | 2.47 | (1.29 to 4.73) | 0.01 |