Table 1.
Baseline Characteristics According to cIMT Quintiles: the ARIC study, 1990 to 1992*
| cIMT Quintile | |||||
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | |
| No. | 2491 | 2492 | 2492 | 2492 | 2492 |
| cIMT median, mm | 0.56 | 0.64 | 0.70 | 0.79 | 0.96 |
| cIMT range, mm | 0.38–0.60 | 0.60–0.67 | 0.67–0.74 | 0.74–0.85 | 0.85–2.98 |
| Carotid plaque | 269 (10.8) | 455 (18.3) | 627 (25.2) | 922 (37.0) | 1849 (74.2) |
| Demographics | |||||
| Age, y | 54.4 (5.2) | 55.9 (5.5) | 56.9 (5.6) | 57.6 (5.7) | 59.4 (5.3) |
| Male sex | 669 (26.9) | 877 (35.2) | 1073 (43.1) | 1259 (50.5) | 1449 (58.2) |
| Black race | 402 (16.1) | 549 (22.0) | 659 (26.4) | 621 (24.9) | 586 (23.5) |
| Education, < high school degree | 360 (14.5) | 435 (17.5) | 498 (20.0) | 539 (21.6) | 697 (28.0) |
| Physiologic indicators | |||||
| Body mass index, kg/m2 | 26.6 (5.0) | 27.7 (5.4) | 28.2 (5.2) | 28.2 (5.1) | 28.1 (5.1) |
| Systolic blood pressure, mm Hg | 115.2 (16.1) | 118.9 (17.1) | 121.2 (17.8) | 123.2 (19.1) | 126.7 (19.7) |
| Use of antihypertensive medication | 527 (21.2) | 659 (26.4) | 711 (28.5) | 839 (33.7) | 917 (36.8) |
| Diabetes mellitus | 179 (7.2) | 269 (10.8) | 356 (14.3) | 362 (14.5) | 491 (19.7) |
| >1 Apolipoprotein E ɛ4 allele | 680 (27.3) | 716 (28.7) | 726 (29.1) | 750 (30.1) | 802 (32.2) |
| Behavioral characteristics | |||||
| Smoking status | |||||
| Current smoker | 508 (20.4) | 488 (19.6) | 503 (20.2) | 541 (21.7) | 705 (28.3) |
| Former smoker | 791 (31.8) | 869 (34.9) | 888 (35.6) | 958 (38.4) | 1043 (41.9) |
| Never smoker | 1192 (47.9) | 1135 (45.6) | 1101 (44.2) | 993 (39.9) | 744 (29.9) |
| Pack‐years smoking | 21.6 (38.4) | 22.2 (38.6) | 25.0 (41.5) | 29.0 (46.2) | 40.7 (51.6) |
ARIC indicates Atherosclerosis Risk in Communities; and cIMT, carotid intima‐media thickness.
*
Continuous variables are expressed as mean (SD), while categorical variables are n (%).