Fig. 2From: Which measuring site in ankylosing spondylitis is best to detect bone loss and what predicts the decline: results from a 5-year prospective studyMean change (percent) in bone mineral density over 5 years in AS patients, for the total group and divided by sex at the different measuring sites. Error bars represent SEM. AP anterior-posterior, BMD bone mineral density, ns not significant, vBMD volumetric BMDBack to article page