Increased efavirenz concentrations were associated with CYP@A@ -@ TG in all subjects ( P = @ ( -@ ) ) and in Black subjects ( P = @ ) and White subjects ( P = @ ) analysed separately ; and with UGT@B@ @ G/G homozygosity in all subjects ( P = @ ) and in Black subjects ( P = @ ) and White subjects ( P = @ ) analysed separately .