In some cases, children are able to read words and their comprehension difficulties go unnoticed. Standardized tests ... reading basics down because by the time a student reaches fourth grade ...

refine and test the effects of a multicomponent intervention to improve fourth- and fifth-grade students’ foundational reading skills (word recognition, morphology and fluency), reading comprehension, ...

After fifth grade, the boost from better decoding instruction disappears. That’s probably because as grades go up, success on reading tests reflects comprehension ability more than decoding ability.