Baseline characteristics.

Summary statistics for continuous variables are presented as mean ± standard deviation. Categorical data are summarized as percentages. VWF:Ag, VWF:CB and ADAMTS13 levels and the VWF:CB/VWF:Ag ratio are presented as median and interquartile range (IQR).连续变量的汇总统计量以均值（mean）±标准差（standard deviation）的形式呈现。分类数据（categorical data）以百分比（percentages）进行汇总统计。VWF:Ag、VWF:CB及ADAMTS13水平，以及VWF:CB/VWF:Ag比值，均以中位数（median）和四分位距（interquartile range, IQR）的形式呈现。