GH1 and acromegaly: Also, serum GH (1.39 (3.37–0.55) vs. 0.32 (0.78–0.09); p < 0.001) and IGF-1 (249.9 ± 189.3 ng/mL vs. 147.1 ± 39.6 ng/m; p = 0.009) levels were significantly higher in patients with acromegaly.