condition mean min max ZT0-3 24.38465 24.38465 24.38465 ZT4-7 38.426550000000006 38.426550000000006 38.426550000000006 ZT8-11 36.866150000000005 36.866150000000005 36.866150000000005 ZT12-15 21.98415 21.98415 21.98415 ZT16-19 13.314900000000002 13.314900000000002 13.314900000000002 ZT20-23 15.1039 15.1039 15.1039