RESULTS	Median [ interquartile range ] efavirenz concentrations were 2,674 ng/mL [ 1,690-4 ,533 ] , 2,667 ng/mL [ 1,753-4 ,494 ] and 2,799 ng/mL [ 1,804-4 ,744 ] at week +2 , week +6 , week 22 , respectively , and 2,766 ng/mL [ 1,941-3 ,976 ] at week 50 .\