Jill - I'm sure yoga has helped some but a *lot* of it is how nervous you are. Doctors even say that they assume blood pressure is higher than normal when you read it in the office, because you are nervous just being there. So that is great that you are getting so comfortable with them!
That is definitely true freespirit - the arm is the best way to measure. Still, if all somebody can afford is a finger one, that's better than nothing to track trends with!