Perceptual and Motor Skills, 1999, 88, 236-239
Authors:  Juan Antonio Amador-Campos, Teresa Kirchner-Nebot

Main point:

Experiment (n=179 boys, 110 girls, mean age 9.0 y). Authors found significant correlation (0.3, p<0.1) between FD/I and sustained attention (measured by Zazzo task) but no correlation was found in the case of Bourdon task. The latter is also a tool for measuring sustained attention.

My comment: There were other tests that correlated with FD/I but I was mainly interested in attention. Author argue that FD/I is commonly associated with attentional process.