It can also be pointed out here that examination of the current literature did not readily show any findings or investigations that were in conflict with one another. However, it is important to realize that the term "learning disability" is really a fairly vague "umbrella" term in which various kinds of disabilities are lumped together. And, to some extent, this is reflected in research.
Hurford, D.P. Schauf, J.D., Bunce, L., Blaich, T. & Moore, K. (1994). Early identification of children at risk for reading disabilities. Journal of Learning Disabilities, 27(6), 371-382.
Researchers have attempted to develop early screening test that look for specific deficits rather than for just learning disabilities generally. For example, Hurford, Johnston, Nepote, Hampton, Moore, Mueller, McGeorge, Huff and Awad (1994) assessed 486 first-quarter first graders on their reading and phonological-processing skills and intelligence. Based on this assessment, and using the classification data from prior research, 99 children were identified as specifically being at risk for reading difficulties.