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  • Title: A double logistic comparison of growth patterns of normal children and children with Down's syndrome.
    Author: Rarick GL, Wainer H, Thissen D, Seefeldt V.
    Journal: Ann Hum Biol; 1975 Oct; 2(4):339-46. PubMed ID: 151525.
    Abstract:
    A double logistic model was used to compare six parameters of growth in standing height of 31 children with Down's syndrome with 136 children from the California Guidance Study. Multivariate analysis of variance of the growth data showed that while there were significant differences in all six parameters favouring the normal over the Down's children, there were no significant differences with respect to error of fit. Multivariate analysis with final height as a covariate revealed that differences between the normal and the Down's children in the prepubertal and adolescent components were explainable by differences in final height. In summary, the double logistic model, when applied to this sample of Down's children, identified those well defined logistic components which are characteristic of the growth of normal children, the differences being those of degree, not of form.
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