condition mean min max ZT0-3 386.462826 386.462826 386.462826 ZT4-7 488.136069 488.136069 488.136069 ZT8-11 442.080202 442.080202 442.080202 ZT12-15 464.802635 464.802635 464.802635 ZT16-19 386.019404 386.019404 386.019404 ZT20-23 428.0668005 428.0668005 428.0668005