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<0.05 compared to patients with at least one complete bridge.
†p<0.05 compared to patients with low BMD.
See 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).

除非另有说明，所有数据以均值±标准差（Standard Deviation，SD）或中位数（范围）表示。
注a：定义为至少两节椎体发生强直。
注b：定义为腰椎及/或髋部骨密度（Bone Mineral Density，BMD）Z值≤−1。
*与存在至少一处完整骨桥的患者相比，差异具有统计学意义（p<0.05）。
†与骨密度减低的患者相比，差异具有统计学意义（p<0.05）。
缩写详见表1。
在是否存在完整骨桥，以及骨密度减低或正常的患者之间，关节外表现或外周关节炎均未发现显著差异（数据未展示）。