Charts and Statistics

According to this statistics,vinegar makes our blood pressure down.This statistics compare three groups.One group doesn't drink vinegar after eating(look at blue line).Another group drink 15ml vinegar after eating(look at green line).The other group drink 30ml vinegar after eating(look at orange line).As you see,blue and orange line group's blood pressure is falling!If you are worried about blood pressure,why don't you drink vinegar after eating?