Table 2 Longitudinal neuropsychological test results for brothers A and B
| Â | Year | Brother | RAVL | Block design | Digit symbol |
|---|---|---|---|---|---|
Baseline | 1995 | A | + 0.74 | + 1.48 | + 1.41 |
+  2 years | 1997 | A | + 0.45 | + 2.00 | + 1.06 |
+  6 years | 2001 | A | + 0.16 | + 1.09 | + 0.97 |
+  11 years | 2006 | A | −1.57 | + 0.70 | + 0.37 |
+  13 years | 2008 | A | −2.91 | −1.64 | −1.35 |
+  14 years | 2009 | A | −3.30 | −1.90 | −2.56 |
Baseline | 1995 | B | −0.32 | + 1.48 | + 0.80 |
+  2 years | 1997 | B | −0.61 | + 2.00 | + 0.54 |
+  6 years | 2001 | B | −0.22 | + 0.57 | + 0.11 |
+  11 years | 2006 | B | −0.41 | + 0.83 | + 0.63 |
+  14 years | 2009 | B | −0.32 | + 1.48 | + 0.46 |
+  16 years | 2011 | B | −0.32 | + 1.35 | + 0.57 |
+  18 years | 2013 | B | + 0.16 | + 0.57 | + 0.11 |
+  22 years | 2017 | B | + 0.16 | + 0.96 | + 0.28 |