RESULTS	The changes in blood pressure at 60 min were not significant The effect on 24-h ambulatory systolic and diastolic blood pressure of regular drinking of green tea [ increases of 1.7 mmHg ( 95 % CI -1.6 to 5.0 ) and 0.9 mmHg ( 95 % CI -1.3 to 3.1 ) , respectively ] or black tea [ increase of 0.7 mmHg ( 95 % CI -2.6 to 4.0 ) and decrease of 0.7 mmHg ( 95 % CI -2.9 to 1.5 ) , respectively ] was not significant relative to caffeine .\