The students in this subset all had previous diagnoses of dyslexia, yet on average they scored at pretest within the normal range on all decoding measures. In Written Language Comprehension, these students scored on average within the low-normal range (27th percentile), suggesting greater difficulty with comprehension than with decoding, and possibly suggesting misdiagnosis. After an average of 103.4 hours of Visualizing and Verbalizing instruction, these students saw average growth of 20 percentile points in Written Language Comprehension. They also made medium growth in Reading Accuracy and Vocabulary.
Students with a Prior Dyslexia Diagnosis Who Received Comprehension Instruction Only
Years: Jan. 2008 – Sept. 2021
Number of Students: 284
Average Age: 12.9
Average Hours of Instruction: 103.4
Lindamood-Bell Instruction Implemented: Visualizing and Verbalizing