In May, 1987, a longitudinal study of children's orofacial, dental and speech characteristics was initiated with the following objectives: ( 1 ) to determine the characteristics that were typical for certain ages; (2) to examine changes in those characteristics over time; (3) to develop reliable methods for observing these factors in children; and, (4) to determine the significant characteristics which warrant professional referrals and follow-up. Two-year retest intervals were established to examine changes in the assessed characteristics. The most recent data collection was conducted in May, 1989. The purpose of this article is to provide prospective data concerning the frequency and stability of behaviors consistent with objectives mentioned above. Information from the original study was previously reported (Hale, Kellum, Nason, and Johnson, 1988). This paper represents the results of the follow-up assessment.
Kellum, G. D., et al. (1989). Orofacial myofunctional factors at ages six and eight, International Journal of Orofacial Myology, 15 (3), 3-7.