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Cross-sectional measurements of serum free IGF-I in the study population. Age distribution of serum free IGF-I levels in males (A) and females (B) are represented respectively. The curves of the 5th, 10th, 25th, 50th, 75th, 90th, and 95th percentiles of free IGF-I value calculated by BCT method using the log-transformed values are displayed.
