Effects of Black Tea on Blood Pressure: A Randomized Controlled Trial

So would someone explain the benefits of green tea which is what I've been drinking?
I don't have high blood pressure.
http://archinte.ama-assn.org/cgi/content/extract/172/2/186
High blood pressure (BP) is a leading risk factor contributing to the global burden of disease. Small changes in BP due to dietary modification may have a significant impact on the prevalence of hypertension and risk of cardiovascular disease.¹

Tea is a popular beverage worldwide and is usually the major source of population flavonoid intake, often providing more than half of total intake.² There is mounting evidence that tea and its flavonoids can make an important contribution to vascular health.³ However, the effects of regular consumption of black tea on BP remain unclear.

Our objective was to assess the effects of regular black tea consumption (3 cups/d) for 6 months on 24-hour ambulatory BP. We found that black tea consumption resulted in significantly . . . [Full Text of this Article]