condition mean min max ZT0-3 492.65000000000003 492.65000000000003 492.65000000000003 ZT4-7 254.3 254.3 254.3 ZT8-11 223.95 223.95 223.95 ZT12-15 248.45 248.45 248.45 ZT16-19 376.45 376.45 376.45 ZT20-23 448.70000000000005 448.70000000000005 448.70000000000005