condition mean min max ZT0-3 0.5500296666666667 0.5013535 0.6147495000000001 ZT4-7 0.4505755 0.4505755 0.4505755 ZT8-11 0.836673 0.836673 0.836673 ZT12-15 0.69256625 0.5042800000000001 0.8808525 ZT16-19 0.6825175 0.6825175 0.6825175 ZT20-23 0.694403 0.694403 0.694403