Fig 1. Box plots showing differences in cognitive performances in different IGF-1 quartiles (1A = Semantic fluency; 1B = Symbol-Digit Modalities Test; 1C = Hopkins Verbal Learning Test-Retention).

Yaxis shows cognitive scores adjusted for age, gender and education according to the regression analysis. According to one-way ANOVA, the lowest quartile presents worse performances as compared to the other quartiles. *: p<0.001. Outliers are showed as circles.