An Investigation of Date of Birth in the Incidence of Learning Disabilities

Abstract

The literature on the epidemiology of various handicapping conditions reflects the interest that researchers have had in the possible role of seasonal variations as correlates of the incidence of specific disabilities. This study investigated the possible relationships between individuals' month and season of birth and their subsequent identification as learning disabled (LD). Birthdate records of 583 LD and 7911 non-LD students in grades K-12 were compared to determine whether monthly or seasonal patterns unique to LD students existed. Non-parametric statistical analysis of the data indicated non-significant differences in birthdate patterns between these two populations. Discussion focuses on the need for caution in presuming the validity of a birthdate effect.