How to identify the worst abnormality in QT values (in Electrocardiogram)?

When identifying QT abnormality (in ECG) , i have5 modalities:1• New >450 msec2• New >480 msec3• New >500 msec4• Increase from baseline >30 msec5• Increase from baseline >60 msec what is the worst value if two of them accrues, for example:1 and5.