(Perhaps literally) playing Devil's Advocate: Could it be that employees that take maternal or paternal (parental) leave are significantly and disproportionate

(Perhaps literally) playing Devil's Advocate: Could it be that employees that take maternal or paternal (parental) leave are significantly and disproportionately more likely to exit a short time after returning from leave? Or else see some other significant pattern of attrition after parental leave - controlling for the absence and costs of the leave over its duration? Not commenting on the ethics or legality of this sort of HR accounting...