In the on-treatment analysis , the median ( interquartile range ) increase in the CD@ count after @ weeks was +@ ( @-@ ) cells per microliter in the efavirenz arm , +@ ( @-@ ) cells per microliter in the ritonavir-boosted atazanavir arm , and +@ ( @-@ ) cells per microliter in the ritonavir-boosted lopinavir arm ( P = @ ) .