Actually, there is a ton of evidence about reading interventions, and it all adds up to OG and LMB for decoding, and lots of practice for fluency.
More than 10-20% of kids struggle with reading. It's more like 30%. But only 10-20% are considered LD. Regardless of diagnosis, nearly all of them respond to structured, systematic, multi-sensory, phonemic awareness-based instruction.
If you want readings on reading, a fellow professional in the field compiled an excellent, but very lengthy, collection of journal articles on the state of the field, which I have found highly informative, that I would be happy to provide a list of references for, on request. (I can't send you the articles, for copyright reasons.)
