Outcome variables included Assessment of SpondyloArthritis international Society criteria for @ % and @ % improvement in disease activity ( ASAS@/@ ) , ASAS partial remission responses ( analyzed by nonresponder imputation ) , AS Disease Activity Score ( ASDAS ) , ASDAS inactive disease , ASDAS major improvement , Bath AS Disease Activity Index ( BASDAI ) , Bath AS Functional Index ( BASFI ) , and Bath AS Metrology Index ( BASMI ) linear score ( analyzed by the last observation carried forward method ) .