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Fasting preinfusion concentrations of total (top) and free (bottom) IGF-I in older men (N = 8) and postmenopausal women (N = 8) pretreated for 10 days with placebo (Pl), estradiol (E2) or testosterone (Te). Data are the mean ± SEM. The P value reflects the overall interventional effect. Means with unshared (unique) alphabetic superscripts differ significantly (see Results).
