condition mean min max ZT0-3 0.390328 0.390328 0.390328 ZT4-7 0.21921200000000002 0.21921200000000002 0.21921200000000002 ZT8-11 0.381814 0.381814 0.381814 ZT12-15 0.3917575 0.3917575 0.3917575 ZT16-19 0.534238 0.534238 0.534238 ZT20-23 0.439116 0.439116 0.439116