Urban subjects exhibited significantly greater motor speed for the right and left hand (TAP, DAT, PEG) than rural subjects, but no other significant differences were observed. Because the distibution of parental education was remarkably different between the urban and rural sample, a subset of rural children whose parents had > 9 years of education were selected
(n = 14) to compare performance with the urban sample (n = 24). After adjusting for age, no significant differences
in test performance were observed between the urban and a subset of the rural subjects with comparable parental education (data not shown).