condition mean min max ZT0-3 0.4593585 0.4593585 0.4593585 ZT4-7 0.6254259166666667 0.6254259166666667 0.6254259166666667 ZT8-11 0.7506015 0.7506015 0.7506015 ZT12-15 1.00706925 1.00706925 1.00706925 ZT16-19 0.7084035 0.7084035 0.7084035 ZT20-23 0.4180155 0.4180155 0.4180155