Abstract
To assess the effect of puberty on the relationship between glycemic control and insulinlike growth factor I (IGF-I) levels in children with insulin-dependent (type I) diabetes mellitus. Simultaneous HbA1 and plasma IGF-I levels were determined in 71 prepubertal (Tanner stage I) and 112 pubertal (Tanner stages II-V) subjects aged 2.7-17.8 yr. Overall, IGF-I levels were positively correlated with both age (r = 0.31, P less than 0.001) and Tanner stage (r = 0.32, P less than 0.001) but only weakly associated with HbA1 values (r = -0.16, P = 0.025). A strong negative association existed between IGF-I and HbA1 levels (r = -0.45, P less than 0.001) in the pubertal subjects, but no such association was apparent in the prepubertal subjects. Multiple regression analyses disclosed a significant independent negative association between IGF-I and HbA1 levels in the pubertal group (P less than 0.001) but not in the prepubertal group. Glycemic control appears to strongly influence IGF-I levels only after the onset of puberty.
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