condition mean min max ZT0-3 1.3281015 0.9019895 1.58507 ZT4-7 0.847632 0.847632 0.847632 ZT8-11 1.2447949999999999 1.2447949999999999 1.2447949999999999 ZT12-15 1.39829825 1.2308965 1.5657 ZT16-19 1.0634465 1.0634465 1.0634465 ZT20-23 1.1064655 1.1064655 1.1064655