Patient characteristics and prevalence of DE determined with qualitative and quantitative methods.

LDS, Loeys-Dietz syndrome; MFS, Marfan syndrome; DSR, dural sac ratio; DE, dural ectasia; NS, not significant; a, difference between LDS and MFS; b, difference between LDS and control; c, difference between MFS and control.Difference*, In this column, p values are shown. Differences were not tested for each level from L1 to S1.

LDS即洛伊斯-迪茨综合征（Loeys-Dietz syndrome）；MFS即马方综合征（Marfan syndrome）；DSR即硬膜囊比率（dural sac ratio）；DE即硬膜囊扩张（dural ectasia）；NS即无统计学意义（not significant）；a代表洛伊斯-迪茨综合征与马方综合征的组间差异；b代表洛伊斯-迪茨综合征与对照组的组间差异；c代表马方综合征与对照组的组间差异。*Difference 列：本列展示p值。L1至S1各水平未进行组间差异检验。