In-hospital mortality stratified by AKI or No-AKI.

K(+)R(−)+K(+)A(−): AKI diagnosed by DIGO criteria but missed by RIFLE or AKIN. *: compared with No-AKI group, P<0.05; #: compared with Stage 1 or Stage Risk, P<0.05; &: compared with Stage 2, P<0.05. In-hospital mortality stratified by AKI or No-AKI.