Incremental Variance in Low-Value Test Ordering Explained by Patient Centered Communication
| Variables, by Model | Adjusted Effect on the Probability of Test Ordering* (95% CI) | P Value | Pseudo-R2 |
|---|---|---|---|
| Base model† | — | — | 9.3% |
| Series 4‡ | |||
| Component 1: patients' experience of illness | 0.1% (−1.0%, 0.8%) | .84 | 9.3% |
| Component 2: psychosocial context | 0.1% (−0.3%, 0.4%) | .71 | 9.3% |
| Component 3: attempt to find common ground | 0.0% (−0.5%, 0.4%) | .86 | 9.3% |
| Series 5§ | |||
| Total MPCC | 0.0% (−0.8%, 0.8%) | .94 | 9.3% |
↵* Adjusted for the randomized controlled trial intervention.
↵† The base model included study arm and standardized patient (patient with back pain requesting magnetic resonance imaging, woman requesting dual-energy x-ray absorptiometry, patient with headache requesting magnetic resonance imaging). Headache was associated with significantly less test ordering than back pain.
↵‡ In series 4, each Measure of Patient-Centered Communication (MPCC) component was included individually in separate models with base model variables.
↵§ Series 5 included the total MPCC together with base model variables.
CI, confidence interval.