When both arms were combined and analyzed as a before-after study , there was a mean decrease in systolic blood pressure of 21.8 mm Hg ( P < .001 ) as well as a decrease in the number of primary care visits from 3.5 in the 6 months before the study to 2.6 during the 6-month study period ( P < .001 ) and 2.4 in the 6 months after the study ( P < .001 ) .
