Baseline ABCS Levels and Estimates of Effectiveness of EvidenceNOW
| Approach | Aspirin | Blood Pressure | Cholesterol | Smoking |
|---|---|---|---|---|
| Event study | ||||
| Baseline level, % (SD) | 64.9 (23.5) | 63.6 (15.0) | 61.5 (19.4) | 62.0 (30.7) |
| Change estimate | 3.39 | 1.59 | 4.43 | 7.33 |
| 95% CI | 0.61, 6.17 | 0.12, 3.06 | 0.33, 8.53 | 4.70, 9.96 |
| P value | 0.0167 | 0.0337 | 0.0342 | 0.0000 |
| Pre-intervention trend test estimate (P value) | 0.58 (0.37) | 0.41 (0.19) | 1.46 (0.27) | 2.03 (0.002) |
| Difference-in-differences, DARTNet comparison (all states) | ||||
| Baseline level, % (SD) (EvidenceNOW) | 65.1 (23.2) | 63.1 (15.2) | 62.5 (19.2) | 64.9 (30.2) |
| Baseline level, % (SD) (DARTNet) | 29.6 (20.3) | 64.7 (20.4) | 39.4 (19.2) | 12.6 (9.1) |
| Change estimate | 3.75 | 2.76 | 3.87 | 8.32 |
| 95% CI | −0.56, 8.06 | −0.06, 5.58 | −3.44, 11.18 | 2.89, 13.75 |
| P value | 0.0875 | 0.0556 | 0.2990 | 0.0027 |
| Parallel trend test estimate (P value) | 0.65 (0.50) | 0.49 (0.46) | 1.49 (0.26) | 1.49 (0.35) |
| Difference-in-differences, DARTNet comparison (EvidenceNOW states) | ||||
| Baseline level, % (SD) (EvidenceNOW) | 64.9 (23.6) | 62.9 (15.3) | 62.0 (19.0) | 61.4 (30.5) |
| Baseline level, % (SD) (DARTNet) | 31.0 (19.6) | 63.6 (16.9) | 40.9 (21.4) | 15.9 (10.7) |
| Change estimate | 4.88 | 2.87 | 3.81 | 11.54 |
| 95% CI | −3.33, 13.09 | 0.07, 5.67 | −6.46, 14.08 | 3.56, 19.52 |
| P value | 0.2444 | 0.0447 | 0.4680 | 0.0046 |
| Parallel-trends test estimate (P value) | −0.54 (0.46) | −0.55 (0.74) | 0.53 (0.72) | 2.67 (0.28) |
Notes: For the event study, baseline levels correspond to the last quarter before intervention begin (fourth quarter of 2015 for the first cohort to fourth quarter of 2016 for the fifth cohort). Estimates of the effect of interventions correspond to average estimates of the fifth to eighth post-intervention quarters. Pre-intervention trend estimates are based on the fourth to second pre-intervention period. For the difference-in-difference analysis, baseline levels correspond to the fourth quarter of 2015. Estimates of the effect of the intervention correspond to average estimates of the interaction term between an indicator for EvidenceNOW practices and 2017 quarters. Parallel-trends tests are based on the first and second quarter of 2016.
Abbreviations: SD, standard deviation; CI, confidence interval.