Table 1.
Baseline demographics of the study cohort, stratified by socioeconomic status
| Quintiles of Socioeconomic Status | Total | P-Value | |||||
|---|---|---|---|---|---|---|---|
| Quintile 1 n = 12521 |
Quintile 2 n = 12513 |
Quintile 3 n = 12565 |
Quintile 4 n = 12511 |
Quintile 5 n = 12580 |
n = 62690 | ||
| Median Income (IQR) | 4,583–34,486 | 34,486–41,117 | 41,118–50,371 | 50,372–60,868 | 60,869–200,001 | <0.001 | |
| Age (Median (IQR)) | 69.0 (61.0, 78.0) | 71.0 (62.0, 79.0) | 70.0 (62.0, 78.0) | 71.0 (63.0, 79.0) | 71.0 (63.0, 79.0) | 70.0 (62.0, 78.0) | < 0.001 |
| Male | 60.6 | 62.8 | 62.5 | 61.7 | 64.2 | 62.4 | < 0.001 |
| Insurance Category | |||||||
| Private Insurance | 54.5 | 63.3 | 59.7 | 58.7 | 61.0 | 59.4 | < 0.001 |
| Public Insurance | 41.1 | 33.0 | 37.2 | 37.9 | 35.2 | 36.9 | <0.001 |
| No Insurance | 4.5 | 3.7 | 3.1 | 3.4 | 3.8 | 3.7 | <0.001 |
| Comorbidities | |||||||
| Coronary artery disease | 86.9 | 86.2 | 86.6 | 83.6 | 83.5 | 85.4 | < 0.001 |
| Dyslipidemia | 77.2 | 80.8 | 82.1 | 82.7 | 84.5 | 81.5 | < 0.001 |
| Diabetes | 33.4 | 34.0 | 32.2 | 31.5 | 32.2 | 32.7 | < 0.001 |
| Hypertension | 82.3 | 85.2 | 84.4 | 82.3 | 82.4 | 83.3 | 0.010 |
| Prior stroke or TIA | 11.5 | 24.1 | 25.2 | 16.4 | 18.0 | 19.0 | < 0.001 |
| Heart failure | 45.4 | 53.6 | 50.9 | 40.1 | 36.5 | 45.3 | < 0.001 |
| Myocardial infarction history | 30.9 | 29.9 | 31.8 | 28.7 | 31.5 | 30.6 | 0.982 |
| CABG within 12 months | 23.29 | 25.4 | 33.8 | 33.2 | 35.8 | 30.3 | < 0.001 |
| Percutaneous coronary intervention within 12 months | 47.0 | 48.8 | 43.0 | 33.7 | 34.7 | 41.4 | < 0.001 |
Continuous variables compared using linear trend test.
Categorical variables compared using Mantel-Haenszel trend test.
*
Defined by patient’s zip code level annual median household income
+
Public insurance refers to Medicare, Medicaid, military, and state insurance