Table 1.
Variable | Level of Exposure |
P Valueb | ||
0–15 Years (n = 600) | 16–25 Years (n = 123) | >25 Years (n = 247) | ||
Demographics | ||||
Age, years | 75.0 (4.9) | 73.9 (4.3) | 73.8 (4.3) | <0.001 |
Gender: female | 68.7 | 82.1 | 83.0 | <0.001 |
Education (≥high school diploma) | 76.6 | 84.3 | 78.7 | 0.12 |
Clinical vascular disease | 11.3 | 9.8 | 9.7 | 0.74 |
Subclinical MRI measures | ||||
Large infarcts | 28.8 | 22.8 | 23.1 | 0.14 |
Small infarcts | 13.6 | 16.3 | 11.7 | 0.48 |
White matter disease | 32.1 | 24.6 | 32.7 | 0.23 |
Subclinical carotid artery measures | ||||
Internal artery thickness >80th percentile | 20.2 | 18.7 | 19.6 | 0.92 |
Common artery thickness >80th percentile | 21.8 | 13.8 | 15.9 | 0.04 |
Stenosis >25% | 39.0 | 35.0 | 34.7 | 0.42 |
Abbreviation: MRI, magnetic resonance imaging.
Values are expressed as mean (standard deviation) or %.
Based on the F test for continuous data and the χ2 test for categorical data.