Clinical and biochemical characteristics of MDS patients stratified according to WHO classification system.

°: by Analysis of Variance (ANOVA) or by χ2-analysis, when indicated.*: variables not normally distributed are expressed as geometric means with 95% CIs.°: 必要时采用方差分析（Analysis of Variance, ANOVA）或χ²检验进行统计分析。 *: 对于非正态分布变量，以几何均数（geometric mean）与95%置信区间（95% CIs）进行表述。