condition mean min max ZT0-3 0.099039 0.064543 0.1619885 ZT4-7 0.22133200000000003 0.22133200000000003 0.22133200000000003 ZT8-11 0.7776695 0.7776695 0.7776695 ZT12-15 0.3801825 0.378583 0.381782 ZT16-19 0.404204 0.404204 0.404204 ZT20-23 0.30813715 0.30813715 0.30813715