condition mean min max ZT0-3 0.802129 0.802129 0.802129 ZT4-7 0.7302694999999999 0.7302694999999999 0.7302694999999999 ZT8-11 0.5416259999999999 0.5416259999999999 0.5416259999999999 ZT12-15 1.5111150000000002 1.5111150000000002 1.5111150000000002 ZT16-19 3.8080266666666667 3.8080266666666667 3.8080266666666667 ZT20-23 2.35702 2.35702 2.35702