Characteristics of AS patients with or without complete bridging and with low or normal BMD.

Values are mean ± SD or median (range) unless otherwise indicated.aDefined as ankylosis of at least two vertebrae.bDefined as lumbar spine and/or hip BMD Z-score ≤ −1.*p†pSee Table 1 for abbreviations.No significant differences in extra-articular manifestations or peripheral arthritis were found between patients with or without complete bridging and low or normal BMD (data not shown).