Table 1

Baseline characteristics by race and age-group

BlacksWhites
≥30 and <45 years old (n = 1,359)≥45 and <60 years old (n = 2,297)≥30 and <45 years old (n = 3,266)≥45 and <60 years old (n = 10,482)
CharacteristicMean (SD) or %Mean (SD) or %P value*Mean (SD) or %Mean (SD) or %P value*
Age (years)35.7 (3.5)51.1 (4.3)37.5 (3.8)52.0 (4.2)
Women (%)58.7%62.9%0.0652.9%54.5%<0.001
SBP (mmHg)113.5 (13.8)125.7 (19.8)0.11111.0 (12.6)118.1 (16.2)<0.001
DBP (mmHg)75.2 (10.5)80.0 (11.9)<0.00173.2 (9.8)73.5 (10.2)<0.001
Normal BP (%)61.1%26.3%0.00867.6%48.4%<0.001
Prehypertensive (%)25.6%25.6%24.3%27.7%
Hypertensive (%)13.3%48.1%8.1%23.9%
HDL-C (mg/dL)51.5 (14.2)56.3 (17.8)<0.00150.4 (13.9)51.6 (16.5)0.29
Triglycerides (mg/dL)83.2 (60.9)104.8 (72.0)0.003100.4 (79.8)128.0 (81.4)<0.001
Fasting glucose (mg/dL)90.2 (8.7)98.5 (10.2)<0.00189.4 (8.0)97.1 (9.3)<0.001
BMI (kg/m2)29.1 (7.0)29.3 (6.0)0.2725.7 (5.0)26.7 (4.7)<0.001
  • Data are mean (SD) or percent, unless otherwise indicated. SD is from the unadjusted distribution. BP, blood pressure; DBP, diastolic blood pressure; SBP, systolic blood pressure.

  • *P value from a simple χ2 or Student t test after adjustment for age and sex where appropriate.

  • †Blood pressure categories: normal, SBP <120 and DBP <80 mmHg and not using antihypertensive medication; prehypertension, not hypertension and SBP 120–139 or DBP 80–89 mmHg; hypertension, SBP ≥140, DBP ≥90 mmHg, or using antihypertensive medication. P values provided reflect the distribution of the three blood pressure categories between the two age-groups within each race.

  • ‡Means and SD from the untransformed distribution. Student t test P value is from the natural log–transformed distribution.