Does age of menarche affect the ultimate level of verbal and spatial skills?

Waber's claim that individual differences in cognition reflect variations in rate of maturation was tested by correlating the performance of 50 right-handed females in verbal and spatial tasks with their age of onset of menstruation. No significant relationships emerged. This suggested that Waber's findings, obtained on adolescents who were still maturing, do not apply to subsequent cognitive outcomes during adulthood.