Table 1.
Baseline characteristics of the study population
| Ages (years) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||
| Variable | <65 (n=2223) | 65-74 (n=715) | 75-84 (n=501) | ≥85 (n=120) | p-value | ||||
| Men | 1479 (66.5%) | 447 (62.5%) | 274 (54.7%) | 44 (36.7%) | <0.001 | ||||
| White | 1297 (58.6%) | 507 (71.0%) | 382 (76.6%) | 88 (73.3%) | <0.001 | ||||
| High school education | 1728 (78.4%) | 518 (73.3%) | 352 (72.1%) | 72 (61.0%) | <0.001 | ||||
| Self-Pay | 605 (28.0%) | 34 (4.9%) | 12 (2.5%) | 1 (0.9%) | <0.001 | ||||
| Avoids health care due to cost | 662 (30.5%) | 82 (11.7%) | 43 (8.7%) | 11 (9.3%) | <0.001 | ||||
| Finances at end of the month | <0.001 | ||||||||
| Some left over | 755(34.7%) | 362 (52.7%) | 285 (58.6%) | 58 (50.9%) | |||||
| Just enough | 833 (38.3%) | 245 (35.7%) | 158 (32.5%) | 46 (40.4%) | |||||
| Not enough | 587 (27.0%) | 80 (11.6%) | 43 (8.8%) | 10 (8.8%) | |||||
| Current smoker | 996 (45.2%) | 137 (19.3%) | 31 (6.2%) | 3 (2.5%) | <0.001 | ||||
| Hypertension | 1525 (68.6%) | 564 (78.9%) | 398 (79.4%) | 91 (75.8%) | <0.001 | ||||
| Diabetes Mellitus | 747 (33.6%) | 296 (41.4%) | 189 (37.7%) | 33 (27.5%) | <0.001 | ||||
| Prior percutaneous coronary intervention | 464 (20.9%) | 169 (23.6%) | 131 (26.1%) | 22 (18.3%) | 0.033 | ||||
| Prior Coronary artery bypass | 263 (11.8%) | 169 (23.6%) | 132 (26.3%) | 21 (17.5%) | <0.001 | ||||
| Prior Myocardial Infarction | 528 (23.8%) | 226 (31.6%) | 147 (29.3%) | 36 (30.0%) | <0.001 | ||||
| Peripheral arterial disease | 108 (4.9%) | 79 (11.0%) | 58 (11.6%) | 21 (17.5%) | <0.001 | ||||
| Prior cerebrovascular accident | 161 (7.2%) | 82 (11.5%) | 66 (13.2%) | 12 (10.0%) | <0.001 | ||||
| Heart failure | 264 (11.9%) | 113 (15.8%) | 84 (16.8%) | 32 (26.7%) | <0.001 | ||||
| Chronic lung disease | 205 (9.2%) | 109 (15.2%) | 68 (13.6%) | 23 (19.2%) | <0.001 | ||||
| Cancer (other than skin) | 106 (4.8%) | 98 (13.7%) | 84 (16.8%) | 19 (15.8%) | <0.001 | ||||
| Body mass index (kg/m2, mean ± SD) | 30.5±7.1 | 29.4±6.3 | 27.3±5.2 | 25.3±4.3 | <0.001 | ||||
| PHQ-9 Depression Score (mean ± SD) | 6.1±5.8 | 4.8±5.0 | 4.5±4.6 | 4.8±4.7 | <0.001 | ||||
| Heart Rate (bpm, mean ± SD) | 84.3±21.4 | 83.7±25.1 | 83.5±21.2 | 88.6±26.1 | 0.137 | ||||
| Systolic Blood Pressure (mmHg) | 145.4±31.1 | 142.9±30.7 | 144.8±30.2 | 146.3±32.2 | 0.286 | ||||
| Hematocrit (%, mean ± SD) | 41.0±5.9 | 38.9±6.0 | 37.9±5.8 | 36.5±5.4 | <0.001 | ||||
| Estimated glomerular filtration rate (ml/min/m2, mean ± SD) | 78.9±31.2 | 65.6±25.6 | 59.6±25.3 | 51.0±21.3 | <0.001 | ||||
| Peak Troponin (ng/ml, mean ± SD) | 16.0±52.4 | 19.2±73.1 | 19.8±77.8 | 29.5±165.0 | 0.120 | ||||
| GRACE mortality risk score (mean ± SD) | 128.8±33.1 | 165.0±30.6 | 182.5±30.6 | 204.5±34.3 | <0.001 | ||||
| Seattle Angina Questionnaire score (mean ± SD) | |||||||||
| Physical Limitation | 81.5±25.1 | 82.7±23.2 | 81.1±24.6 | 72.3±30.3 | 0.020 | ||||
| Angina Frequency | 82.8±22.5 | 83.5±23.0 | 83.0±23.4 | 80.6±24.8 | 0.615 | ||||
| Quality of Life | 58.4±24.3 | 64.9±24.0 | 65.7±23.0 | 66.5±24.5 | <0.001 | ||||
| Summary Score | 73.9±19.7 | 76.5±19.1 | 76.0±19.3 | 73.7±21.3 | 0.006 | ||||
| Short-Form 12 score (mean ± SD) | |||||||||
| Physical Component Summary | 41.3±12.8 | 40.1±12.5 | 38.7±12.3 | 35.8±10.9 | <0.001 | ||||
| Mental Component Summary | 47.6±12.1 | 51.1±10.2 | 53.0±10.3 | 53.2±10.7 | <0.001 | ||||