condition mean min max ZT0-3 1.38084175 1.0158135 1.74587 ZT4-7 1.377639 1.377639 1.377639 ZT8-11 1.2719179999999999 1.2719179999999999 1.2719179999999999 ZT12-15 0 0 0 ZT16-19 2.575815 2.575815 2.575815 ZT20-23 1.2152755 1.2152755 1.2152755