Fig. 2
Scatterplot showing the association between the NIH-TCB cognitive composite and Stanford-Binet full-scale IQ (z deviation method). Dotted lines represent the 95 % confidence interval around the regression line. Note that the regression line and correlation (−12.76 + 1.17×; R 2 = .79) show that the composite is a strong predictor of IQ in these samples of individuals with ID