Prevalence of Masked Hypertension in African Americans

73 African Americans aged 18 to 85 years attending a primary care ambulatory internal medicine clinic in southeast Michigan, with normal clinic blood pressure (<140/90 mm Hg) on three consecutive visits and no prior diagnosis of hypertension or use of blood pressure-lowering medications. Mean age 49.8 years, 53% women.

24-hour ambulatory blood pressure monitoring (ABPM) with measurements every 30 minutes while awake and every 60 minutes while asleep

Prevalence of masked hypertension (defined as average 24-hour BP ≥135/85 mm Hg, awake average ≥140/90 mm Hg, or asleep average ≥125/75 mm Hg)surrogate