“…mellitus (21), surgical time (21), work relative value unit (21), emergency surgery (21), patient comorbidities (16,28,38), Elixhauser comorbidities ( 9) procedure (THA/ TKA) (16), demographics (39), healthcare use (39), comorbidities selected by veteran affair surgical quality improvement programme (VASQIP) nurses (39), and clinical comorbidity (15). For complications, between-hospital variations were case-mix-adjusted for age (9,10,14,15,16,21,27,41,42,48,50), gender (9,10,14,15,21,27,41,42,48,50), ethnicity (21,41,42), Elixhauser comorbidities (9,41,48), patient comorbidities (14,16,27,38,42), ASA score (10,21), procedure (THA or TKA...…”