Improving reading comprehension, science domain knowledge, and reading engagement through a first-grade content literacy intervention

Cluster RCT, 38 first-grade classrooms: knowledge-building units improved domain knowledge, listening comprehension and a distal reading-comprehension measure.

Full text: a 10-lesson unit; the ES .40 was a four-item listening measure (alpha .35) and the general reading test rose ES .11 — narrowed C17's size range to about 0.1–0.25 SD (weakened 2026-10-30).