TABLE 5.
Association of measure adherence with survival on adjusted Cox proportional hazards modeling
| Measure | Hazard ratio (95% CI) | P value |
|---|---|---|
| Measure 1: Clinical stage documented | 1.46 (1.40-1.53) | <.01 |
| Measure 2: Confirm pathologic diagnosis | 0.90 (0.81-1.02) | .09 |
| Measure 3: Lymph node sampling | 0.65 (0.63-0.68) | <.01 |
| Measure 4: Anatomic resection for T1b | 0.69 (0.66-0.72) | <.01 |
| Measure 5: R0 resection achieved | 0.56 (0.54-0.59) | <.01 |
| Measure 6: Chemotherapy for stage II | 0.77 (0.74-0.80) | <.01 |
| Measure 7: Biopsy before radiation | 1.05 (1.00-1.10) | .07 |
Each measure was evaluated with a separate regression model, using patient-level adherence to that specific measure as the primary exposure. All models were fully adjusted for patient age, sex, race, insurance status, Charlson comorbidity score, cancer stage, treatment at multiple facilities, distance traveled to treating facility, geographic location, metropolitan area, academic institution, and average annual hospital lung cancer volume. American Joint Committee on Cancer seventh edition staging was used.13 CI, Confidence interval.