condition mean min max ZT0-3 0.8140434166666667 0.8140434166666667 0.8140434166666667 ZT4-7 0.8595975 0.8595975 0.8595975 ZT8-11 1.04782125 1.04782125 1.04782125 ZT12-15 0.85526275 0.85526275 0.85526275 ZT16-19 0.721267 0.721267 0.721267 ZT20-23 0.703306 0.703306 0.703306