Table. Baseline Characteristics.
| Characteristic | Copayment Reduction Intervention (n = 5109) | Usual Care (n = 3264) | Standardized Difference |
|---|---|---|---|
| Socioeconomic | |||
| Age, median (IQR), y | 62 (54-70) | 62 (54-70) | −0.01 |
| Male | 3470 (67.9) | 2194 (67.2) | 0.01 |
| Nonwhite race | 550 (10.8) | 441 (13.5) | 0.08 |
| Private health insurance | 3237 (63.4) | 2113 (64.7) | −0.03 |
| Employed | 2386 (46.7) | 1475 (45.2) | 0.06 |
| College degree or higher | 2401 (47.0) | 1679 (51.4) | −0.09 |
| Low health literacy | 744 (14.6) | 428 (13.1) | 0.04 |
| Self-reported difficulty getting medical care | 2484 (48.6) | 1411 (43.3) | 0.12 |
| Financial hardship paying for medications | |||
| Extreme/moderate | 960 (18.8) | 527 (16.2) | 0.16 |
| Some/low | 1613 (31.6) | 939 (28.8) | |
| None | 1942 (38.0) | 1518 (46.5) | |
| Missed >1 dose of medication in last month because of cost | 1240 (24.3) | 930 (28.5) | −0.09 |
| Medical history | |||
| Prior myocardial infarction | 1000 (19.6) | 713 (21.8) | −0.06 |
| Prior percutaneous coronary intervention | 1249 (24.5) | 874 (26.8) | −0.05 |
| Prior coronary artery bypass graft | 533 (10.4) | 392 (12.0) | −0.05 |
| Prior stroke or transient ischemic attack | 310 (6.1) | 240 (7.4) | −0.05 |
| Prior heart failure | 357 (7.0) | 292 (9.0) | −0.07 |
| Peripheral arterial disease | 288 (5.6) | 231 (7.1) | −0.06 |
| Chronic kidney disease with dialysis | 87 (1.7) | 69 (2.1) | −0.03 |
| Diabetes | 1628 (31.9) | 1105 (33.9) | −0.04 |
| Current or recent smoker | 1744 (34.1) | 1063 (32.6) | 0.03 |
| Weight, median (IQR), kg | 89 (77-104) | 89 (77-104) | 0.00 |
| In-hospital characteristics | |||
| ST-elevation myocardial infarction | 2377 (46.5) | 1470 (45.0) | 0.03 |
| Multivessel disease | 2403 (47.0) | 1465 (44.9) | 0.02 |
| Percutaneous coronary intervention | 4615 (90.3) | 2852 (87.4) | 0.09 |
| Drug-eluting stent | 4210 (91.2) | 2517 (88.3) | 0.10 |
| Coronary artery bypass graft | 77 (1.5) | 48 (1.5) | 0.00 |
Abbreviation: IQR, interquartile range.