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Table 1 Characteristics of the cohort sample and the cohort subsets*: pre-existing disease, high risk, and low risk subsets, the Atherosclerosis Risk in Communities Cohort Limited Access Data, 1987–89.

From: Common carotid arterial interadventitial distance (diameter) as an indicator of the damaging effects of age and atherosclerosis, a cross-sectional study of the Atherosclerosis Risk in Community Cohort Limited Access Data (ARICLAD), 1987–89

  Cohort Sample N = 8163 Subsets* of Cohort Sample
   Pre-existing Disease N = 591 High Risk N = 6175 Low Risk N = 1397 p-value
Age (mean, std) 54.2 (5.7) 56.5 (5.3) 54.4 (5.7) 52.2 (5.4) <0.0001
Male Gender (%) 44.8 64.3 44.8 36.7 <0.0001
Black Race (%) 25.5 25.5 28.7 12.3 <0.0001
Height in cm (mean, std) 168.5 (9.3) 170.4 (8.9) 168.4 (9.3) 168.0 (9.0) <0.0001
Stroke (%) 2.4 33.7 0§ 0§ NA
Coronary Heart Disease 5.2 72.2 0§ 0§ NA
Plaque or Shadowing 35.7 52.7 44.0 0§ 0.0002
Smoker (%)      
   Current 26.9 29.6 32.8 0§ 0.0783§§
   Former 31.8 43.8 28.7 40.5  
   Never 41.3 26.6 38.5 59.5  
Cigarette Years for Current Smokers (mean, std) 681.9 (438.9) 845.3 (532.4) 667.7 (427.1) N/A <0.0001
Drinker (%)      
   Current 56.3 48.6 55.4 63.4 <0.0001§§
   Former 19.3 31.5 19.1 14.9  
   Never 24.4 20.0 25.5 21.7  
Ethanol g/wk for Current Drinkers (mean, std) 76.3 (119.1) 87.8 (125.5) 81.1 (125.8) 54.1 (81.9) <0.0001
Diabetes (%) 11.4 22.3 12.9 0§ <0.0001
Hypertension (%) 35.5 54.3 41.7 0§ <0.0001
Cholesterol Medication Use (%) 3.0 6.5 3.3 0§ <0.0001
Body Mass Index (mean, std) 27.7 (5.3) 28.2 (5.4) 28.3 (5.5) 24.7 (2.8) <0.0001
Systolic Blood Pressure mm Hg (mean, std) 121.4 (18.7) 122.7 (21.6) 123.5 (19.0) 111.5 (12.0) <0.0001
Diastolic Blood Pressure mm Hg (mean, std) 73.7 (11.3) 72.6 (12.5) 74.8 (11.5) 69.6 (8.5) <0.0001
LDL Cholesterol mg/dl (mean, std) 138.2 (39.5) 145.2 (39.5) 142.5 (40.3) 116.2 (26.0) <0.0001
HDL Cholesterol mg/dl (mean, std) 51.5 (17.0) 44.6 (15.9) 50.4 (16.2) 59.2 (18.7) <0.0001
Fibrinogen (mean, std) 304.3 (65.3) 321.9 (72.0) 308.6 (65.0) 277.5 (55.5) <0.0001
White Blood Count (thousands) (mean, std) 6.2 (2.1) 6.7 (3.3) 6.3 (2.0) 5.4 (1.5) <0.0001
  1. *Subsets: Pre-existing disease = prevalent CHD or stroke; High risk = absence of pre-existing disease + either diabetes, hypertension, body mass index ≥ 30, current cigarette smoking, LDL cholesterol ≥ 160 mg/dL, use of cholesterol lowering medication, or presence of plaque or shadowing on B-mode ultrasound; Low risk = absence of pre-existing disease and risk factors.
  2. Percentages may not total to 100% because of rounding.
  3. N = maximum possible in the cohort or subsets. For some variables, smaller numbers are available because of missing values.
  4. Variable levels were used to distinguish between the high risk factor and low risk subsets.
  5. N/A since smokers were excluded from low risk subset.
  6. §Subset was defined by the absence of the characteristic.
  7. §§Comparison of equality of proportions of current smokers and current drinkers between groups.