considering the total sample ( n = 157 ) , nh3 concentrations were found to be linearly and directly correlated with vpa plasma concentration ( n = 125 , r = 0.249 , p less than 0.001 ) , pb concentration ( n = 86 , r = 0.411 , p less than 0.001 ) , sum of vpa-pb concentration ( n = 60 , r = 0.721 , p less than 0.001 ) , and sum of vpa-pb-pht concentration ( n = 33 , r = 0.802 , p less than 0.001 ) .
C0031412
pb
C1875648
pb-pht