Table 1:
Baseline characteristics of the study cohorts.
| Variable | MRI n=3,075 (%) | No MRI n=340,090 (%) | P-value |
|---|---|---|---|
| Women | 47.6 | 43.6 | 0.043 |
| Race | |||
| White | 65.8 | 72.8 | 0.005 |
| Black | 11.2 | 9.3 | |
| Hispanic | 12.4 | 9.3 | |
| Asian or Pacific Islander | 6.4 | 3.3 | |
| Native American | 0.0 | 3.3 | |
| Other | 4.2 | 3.1 | |
| Median age, y | 63.7 | 62.5 | 0.161 |
| Median annual income in patient’s zip code, US$ | |||
| $1–$38,999 | 20.5 | 26.3 | <0.001 |
| $39,000–$47,999 | 19.2 | 24.6 | |
| $48,000–$62,999 | 23.3 | 24.7 | |
| $63,000 or more | 37.0 | 24.5 | |
| Insurance type | |||
| Medicaid | 56.6 | 54.6 | 0.020 |
| Medicare | 10.6 | 9.1 | |
| Private | 27.0 | 26.5 | |
| Uninsured | 5.8 | 9.8 | |
| Hospital characteristics | |||
| Hospital region | |||
| Northeast | 49.1 | 20.6 | <0.001 |
| Midwest | 13.0 | 21.5 | |
| South | 19.4 | 34.8 | |
| West | 18.5 | 23.1 | |
| Hospital bed size | |||
| Small | 7.0 | 8.0 | 0.341 |
| Medium | 20.5 | 23.4 | |
| Large | 72.5 | 68.6 | |
| Location of hospital | |||
| Rural hospital | 4.2 | 4.1 | 0.907 |
| Urban hospital | 95.8 | 95.9 | |
| Teaching status of hospital | |||
| Non-teaching hospital | 23.9 | 30.2 | 0.020 |
| Teaching hospital | 76.1 | 69.8 | |
| Comorbidities | |||
| Dementia | 14.5 | 16.0 | 0.291 |
| History of myocardial infarction | 4.4 | 4.4 | 0.971 |
| Malignancy | 2.9 | 2.0 | 0.092 |
| Thrombocytopenia | 4.1 | 4.2 | 0.852 |
| Chronic liver disease | 6.3 | 4.9 | 0.125 |
| Human immunodeficiency virus | 0.5 | 0.2 | 0.050 |
| Hypertension | 58.1 | 51.4 | 0.002 |
| Diabetes mellitus | 22.0 | 18.8 | 0.052 |
| Chronic obstructive lung disease | 8.1 | 6.9 | 0.268 |
| Chronic kidney disease | 10.9 | 9.1 | 0.133 |
| Atrial fibrillation/flutter | 11.9 | 13.8 | 0.190 |
| Coronary artery disease | 16.9 | 17.9 | 0.560 |
| Peripheral artery disease | 3.6 | 4.2 | 0.477 |
| Obesity | 4.1 | 3.5 | 0.417 |
| Congestive heart failure | 5.4 | 8.8 | 0.004 |