Establishing Normative Data For The Dyslexia Determination Test (DDT) In Non-Dyslexic Second Grade Students.

The purpose of this study is to evaluate the validity of the Dyslexia Determination Test (DDT). The researchers administered the DDT to 29 non-dyslexic students midway through their second grade educational year. According to the testing criteria of the DDT, 3 of the 29 students (10.2%) tested as having either mild, moderate, or marked dysnemkinesia. 18 students (62.0%) tested as having mild or moderate dyseidesia. 2 students (6.9%) tested as having mild or marked dysphonesia. Research concluded that the DDT is a useful tool for determining second grade students with dysphonesia and dysnemkinesia, but is likely not as sensitive at determining students with dyseidesia at such a young age. The DDT also revealed shortcomings in identifying children who omit letters or numbers when writing the a through z letter sequence, and 1 through 10 number sequence.