IGF1 and acromegaly: The probability of disease control was dependent on baseline IGF-1 value: patients with IGF-1 values <300 μg/L had the lowest risk of not controlling acromegaly at the last visit/end of the follow-up (ES = 0.29, 95% CI: 0.23–0.36; in pairwise comparisons, all P-values were <0.05 vs other groups of IGF-1 level at baseline).