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Figure 3 Forearm blood flow response to sodium nitroprusside (NP) infusion in the placebo- and growth hormone (GH)-treated patients at baseline and at the end of treatment. Data were analyzed by analysis of variance for repeated measures. p < 0.005 for the basal response to NP; p = 0.013 for the effect of GH treatment; p = NS for the interaction between GH and NP.