In 325 aphasia patients, grade criterion of the boston diagnostic aphasia grade 0, 1, 2, 3, 4 were 84, 79, 77, 63, 22 cases respectively and many of 0 and 1 grade were distributed classical language centers.

• 波士顿诊断性失语严重程度分级标准评定结果:0级84例,1级79例,2级77例,3级63例,4级22例,其中失语严重程度为0级、1级的患者多为经典的语言中枢受累。