Table 1.
Baseline Demographics, Hospital Characteristics, and Comorbidities of patients admitted with ST-Elevation myocardial infarction
| Variable | Overall | COPD | P-value | |
|---|---|---|---|---|
| (n=2,120,005) | NO (n=1,840,517) |
YES (n=279,488) |
||
| Age, mean ± SD (years) | 65.1 ± 14.7 | 64.5 ± 14.9 | 69.0 ± 12.5 | <0.001 |
| Women | 35.6% | 35.0% | 39.6% | <0.001 |
| White | 79.3% | 78.2% | 86.4% | |
| Black | 7.6% | 8.0% | 5.2% | |
| Hispanic | 7.2% | 7.6% | 4.6% | |
| Asian or Pacific Islander | 2.2% | 2.3% | 1.1% | |
| Native American | 0.5% | 0.5% | 0.4% | |
| Other | 3.3% | 3.5% | 2.3% | |
| Payer status | ||||
| Primary expected payer | <0.001 | |||
| Medicare | 48.7% | 46.4% | 64.2% | |
| Medicaid | 5.6% | 5.5% | 6.1% | |
| Private insurance | 34.8% | 36.8% | 21.5% | |
| Self-pay | 7.1% | 7.4% | 4.9% | |
| No charge | 0.6% | 0.7% | 0.4% | |
| Other | 3.2% | 3.2% | 2.9% | |
| Median household income (percentile) | <0.001 | |||
| 0 to 25th | 27.2% | 26.5% | 32.1% | |
| 26th to 50th | 27.6% | 27.2% | 29.9% | |
| 51st to 75th | 24.4% | 24.6% | 22.6% | |
| 76th to 100th | 20.8% | 21.6% | 15.4% | |
| US Region | <0.001 | |||
| Northeast | 16.9% | 17.3% | 14.7% | |
| Midwest | 24.6% | 24.4% | 25.7% | |
| South | 39.7% | 39.2% | 43.0% | |
| West | 18.9% | 19.2% | 16.6% | |
| Hospital Bed size | <0.001 | |||
| Small | 9.8% | 9.6% | 10.9% | |
| Medium | 22.9% | 22.8% | 23.3% | |
| Large | 67.3% | 67.6% | 65.8% | |
| Urban location | 87.8% | 88.4% | 83.6% | <0.001 |
| Teaching Hospital | 45.4% | 46.4% | 38.7% | <0.001 |
| Weekend admission | 26.8% | 26.9% | 26.1% | <0.001 |
| Comorbiditie* | ||||
| Smoker | 34.9% | 33.2% | 46.0% | <0.001 |
| Diabetes mellitus (uncomplicated) | 23.2% | 23.3% | 23.1% | 0.06 |
| Diabetes mellitus (complicated) | 3.3% | 3.2% | 3.7% | <0.001 |
| Hypertension | 56.7% | 56.8% | 55.4% | <0.001 |
| Dyslipidemia | 47.5% | 48.7% | 39.5% | <0.001 |
| Obesity+ | 8.8% | 8.9% | 8.3% | <0.001 |
| Prior myocardial infarction | 7.1% | 6.9% | 8.6% | <0.001 |
| Prior percutaneous coronary | 8.1% | 8.1% | 8.1% | 0.55 |
| intervention | ||||
| Prior coronary artery bypass | 4.2% | 4.0% | 5.1% | <0.001 |
| grafting | ||||
| Prior cerebrovascular | 2.9% | 2.8% | 3.4% | <0.001 |
| vascular accident | ||||
| Atrial fibrillation | 13.5% | 12.7% | 18.8% | <0.001 |
| Heart failure | 0.6% | 0.5% | 0.9% | <0.001 |
| Peripheral vascular disease | 7.3% | 6.3% | 13.3% | <0.001 |
| Renal Failure | 8.3% | 7.8% | 11.6% | <0.001 |
COPD= chronic obstructive pulmonary disease; US= united states; SD= standard deviation.
*
Co-morbidities were extracted using the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) and Clinical Classifications Software (CCS) Codes. A complete list and details of comorbidities is available in e-Table 2.
+
Obesity defined as pre-specified by ICD-9 codes in the database.14