Post neonatal mortality rates were where african americans had higher levels of political power.

Post neonatal mortality rates were "lower" where African Americans had higher levels of political power.

The post neonatal rate is the quantity of passings or deaths happening following 28 days of age and before one year, i.e. after the neonatal period, given as a rate for every thousand live births for each year. It can be given by the newborn child death rate minus the neonatal death rate. 

Apart of the parietal lobe