C 應改為 至少為4級,當4級時: Avoidances and frustrations are obvious. 資料來源: http://publications.iowa.gov/29713/1/IowasSeverityRatingScaleforCommunicationDisabilities_1978.pdfP.26
3 下述愛荷華口吃嚴重度量表(Iowa scale of severity of..-阿摩線上測驗