Demographics and characteristics
| N=732 | Overall n=732 n (%) | Cases n=366 n (%) | Controls n=366 n (%) | P value |
| Age, mean (SD) | 56.0 (11.6) | 56.7 (10.6) | 55.4 (12.6) | 0.08 |
| Female | 458 (63) | 225 (62) | 233 (64) | 0.52 |
| White | 102 (14) | 49 (13) | 53 (15) | 0.67 |
| African-American | 580 (79) | 296 (81) | 284 (78) | 0.27 |
| Hispanic | 8 (1) | 5 (1) | 3 (1) | 0.48 |
| Insurance | 0.37 | |||
| Commercial | 11 (2) | 6 (2) | 5 (1) | |
| Medicaid | 306 (42) | 154 (42) | 152 (42) | |
| Medicare | 123 (17) | 64 (18) | 59 (16) | |
| Private | 262 (36) | 134 (37) | 128 (35) | |
| Self-pay | 26 (4) | 8 (2) | 18 (5) | |
| Exclusion-related conditions | ||||
| Any congestive heart failure | 64 (8.7) | 35 (9.56) | 29 (7.92) | 0.43 |
| Advanced renal failure | 13 (1.8) | 4 (1.09) | 9 (2.46) | 0.16 |
| Severe mental illness | 35 (4.8) | 18 (4.92) | 17 (4.64) | 0.86 |
| Cognitive impairment | 4 (0.5) | 1 (0.27) | 3 (0.82) | 0.32 |