In the October 2008 issue of "Heart Advisor," there was an article about home monitoring of blood pressure. The illustration shows a man slouched in a chair with his legs crossed taking his pressure. Everything I have ever read in the way of instruction says you should sit up straight with both feet flat on the floor?
D001795:Blood Pressure Determination / Q000592:standards*; D006801:Humans; D011187:Posture