There are high positive correlations between the percentages of learning disabled children and their months of birth in Hawaii. The relationships are similar for the sexes and do not decrease with age. The LD children born early or late in the year show differences in variability of IQ subtests and age of referral. This, together with a trend towards IQ differences, suggests that simple immaturity at school entrance is an insufficient explanation for the relationships observed. An investigation of the neuropsychological characteristics of early-born and late-born LD children is in progress.
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References
1.
Barr, A.J., Goodnight, J.H., Sall, J.P., Blair, W.H., & Chilko, D.M.SAS User's Guide, Raleigh, N.C.: SAS Institute, 1979.
2.
Diamond, G.H.The birthdate effect in Hawaii's learning disabled school population. Presented at the 3rd annual conference of the Hawaii Educational Research Association Honolulu, January 1981.
3.
Di Pasquale, G.W., Moule, A.D., & Flewelling, R.W., The birthdate effect. Journal of Learning Disabilities, 1980, 13, 234–238.
4.
Gredler, G.R.The birthdate effect: Fact or artifact?Journal of Learning Disabilities, 1980, 13, 239–242.
5.
Hare, E., Price, J. & Slater, E.Mental disorder and season of birth: A national sample compared with the general population. British Journal of Psychiatry, 1974, 124, 82–86.
6.
Hawaii, Department of Education. Office of Instructional Services. Program standards and guidelines for special education and special services in Hawaii. Honolulu: Author, 1977.
7.
Hawaii, Department of Health. Annual Report. Honolulu, Author, 1960–1975.
8.
Pasamanick, B., & Knobloch, H.Retrospective studies on the epidemiology of reproductive casualty: Old and new. Merril-Palmer Quarterly of Behavior and Development, 1966, 12, 7–26.
9.
Selz, M., & Reitan, R.M.Rules for neuropsychological diagnosis: Classification of brain function in older children. Journal of Consulting & Clinical Psychology, 1979, 47, 258–264.
10.
United States. National Weather Science Publication. Ashville, N.C.: National Climatological Center, 1979.
11.
Warren, C.W., & Tyler, C.W.Social status and season of birth: A study of a metropolitan area in the Southeastern United States. Social Biology, 1979, 26, 275–288.
