To address the challenge of improving third grade reading comprehension, we developed and evaluated the long-term effects of a sustained content literacy intervention called the Model of Reading Engagement (MORE), which emphasizes building domain and topic knowledge schemas from Grade 1 to Grade 3. The MORE intervention emphasizes thematic lessons that provide an intellectual framework for helping students connect new learning to a general schema (e.g., how scientists study past events, how systems function properly). Over three years, the treatment group students participated in (a) spring Grade 1 thematic content literacy lessons in science and social studies, (b) fall to spring Grade 2 thematic content literacy lessons in science, (c) remote Grade 3 thematic content literacy lessons in science, and (d) wide reading of thematically related informational texts in the summer months following Grade 1 and Grade 2. During the third grade school year (SY 2020-21), the COVID-19 pandemic required remote schooling to be in place from fall to spring and the Grade 3 MORE was provided to both treatment and control students. Accordingly, we examine long-term effects on third graders’ outcomes comparing a treatment group that received the Grade 1, Grade 2, and Grade 3 MORE treatment to a control condition that received the Grade 3 MORE treatment. Intent-to-treat estimates show that the students randomly assigned to the treatment condition outperformed control students in reading comprehension (ES = 0.11) and mathematics (ES = 0.14) on third grade state standardized assessments. Subgroup analyses also revealed positive impacts for student living in low- to moderate-socioeconomic status neighborhoods on both reading comprehension (ES = .13) and mathematics (ES = .20). Findings indicate that a sustained content literacy intervention may be a scalable approach for accelerating and equalizing third-graders’ reading comprehension and math outcomes.
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