A Two-Study Conceptual Replication Investigating the Role of Initial Word-Reading Skills with Response to Intervention for High School Students

This investigation examined the impact of preintervention word-reading ability on reading comprehension outcomes for ninth graders with learning disabilities, reading difficulties, and English learners in treatment and comparison conditions. Secondary data analyses were conducted for two separate but related experimental studies of intensive reading interventions. Both studies provided yearlong intensive reading interventions to ninth graders. The study included replication of a post hoc analysis employed in a previous study of ninth graders who also received 1 year of intervention. Results from both studies demonstrated that the effects of treatment were not moderated by decoding level for reading comprehension. Statistically significant effects of verbal ability were found. These findings suggest the effectiveness of intervention and that higher verbal skills improve students’ comprehension, though the effects were more pronounced for Study One than Study Two.