condition mean min max ZT0-3 1.974605 1.9644849999999998 1.984725 ZT4-7 2.206365 2.206365 2.206365 ZT8-11 4.72813 4.72813 4.72813 ZT12-15 0 0 0 ZT16-19 4.538575 4.538575 4.538575 ZT20-23 3.300725 3.300725 3.300725