Hi. Yesterday, at a pulmonary rehab session I asked what my FEV1 score of 55% means. I was told it is 55% of an estimated predicted mean figure. When I asked what the predicted mean is, I was told that information isn't available! Now I understand personal health information has to be transparent but it is completely meaningless to inform patients of their FEV1 when this is obscured by pulmonary jargon.