condition mean min max ZT0-3 19.1854 19.1854 19.1854 ZT4-7 10.671524999999999 10.671524999999999 10.671524999999999 ZT8-11 20.5793 20.5793 20.5793 ZT12-15 24.55135 24.55135 24.55135 ZT16-19 25.318550000000002 25.318550000000002 25.318550000000002 ZT20-23 21.36635 21.36635 21.36635