condition mean min max ZT0-3 0.04051498333333333 0.0332767 0.0525086 ZT4-7 0.0162805 0.0162805 0.0162805 ZT8-11 0.273659 0.273659 0.273659 ZT12-15 0.5243735 0.3427825 0.7059645 ZT16-19 0.42712 0.42712 0.42712 ZT20-23 0.07405875 0.07405875 0.07405875