Table 1.
Baseline characteristics of the Atherosclerosis Risk in Communities Cohort.
| Entire cohort (n=14,433) |
Black Race (n=3,558) |
White Race (n=10,875) |
|
|---|---|---|---|
| Clinical characteristics* | |||
| Age, years | 54.2 (5.8) | 53.5 (5.8) | 54.4 (5.7) |
| Women, No (%) | 7981 (55.3) | 2210 (62.11) | 5771 (53.07) |
| Alcohol, g/wk, mean (SD) | 42.3 (94.7) | 31.7 (96.0) | 45.8 (94.1) |
| Smoking, Prior or current, No (%) | 8409 (58.26) | 1899 (53.37) | 6510 (59.87) |
| Body mass index, kg/m2 | |||
| <25 | 4819 (33.4) | 779 (21.9) | 4040 (37.2) |
| 25–30 | 5718 (39.6) | 1351 (38.0) | 4367 (40.2) |
| ≥ 30 | 3896 (27.0) | 1428 (40.1) | 2468 (22.7) |
| Waist Circumference, cm | 96.9 (13.9) | 98.9 (15.1) | 96.3 (13.4) |
| Systolic blood pressure, mm Hg | 120.9 (18.6) | 128.4 (21.0) | 118.5 (17.0) |
| Hypertension, No (%) | 4868 (33.7) | 1929 (54.2) | 2939 (27.0) |
| Diabetes mellitus, No (%) | 1510 (10.5) | 571 (16.1) | 939 (8.6) |
| Ratio of total to HDL cholesterol, mean (SD**) | 0.25 (0.1) | 0.27 (0.1) | 0.24 (0.1) |
| Prevalent heart failure, No (%) | 628 (4.4) | 228 (6.4) | 400 (3.7) |
| Myocardial infarction, No (%) | 561 (3.9) | 121 (3.4) | 440 (4.1) |
| AV nodal agents (beta-blockers or calcium channel blockers), No (%) | 1843 (12.8) | 450 (12.7) | 1393 (12.8) |
| Heart rate, mean (SD), beats/min | 67 (10) | 67 (11) | 67 (10) |
| Electrocardiographic LVH, No (%) | 287 (2.0) | 189 (5.3) | 98 (0.9) |
| QRS interval, mean (SD) | 97.4 (12.3) | 96.2 (12.3) | 97.8 (12.3) |
| P wave indices | |||
| Maximum P wave duration, ms | 108.3 (12.4) | 112.4 (12.2) | 107.0 (12.1) |
| Mean P wave duration, ms | 105.4 (12.8) | 109.5 (12.6) | 104.1 (12.6) |
| P wave terminal force, µV·sec | 1.74 (1.8) | 2.14 (2.1) | 1.61 (1.7) |
| PR interval, mean (SD), ms | 164.0 (25.1) | 172.5 (27.1) | 161.2 (23.8) |
*
Values are mean (SD) except as noted.
Abbreviations: SD, standard deviation; HDL, high-density lipoprotein; LVH, left ventricular hypertrophy.