condition mean min max ZT0-3 0.8060451666666667 0.6539280000000001 0.937129 ZT4-7 0.670844 0.670844 0.670844 ZT8-11 0.0462171 0.0462171 0.0462171 ZT12-15 0.23325850000000004 0.089894 0.37662300000000004 ZT16-19 0.304342 0.304342 0.304342 ZT20-23 0.5878835 0.5878835 0.5878835