condition mean min max ZT0-3 0.6096856666666667 0.6096856666666667 0.6096856666666667 ZT4-7 0.3937135 0.3937135 0.3937135 ZT8-11 0.411447 0.411447 0.411447 ZT12-15 0.39042449999999995 0.39042449999999995 0.39042449999999995 ZT16-19 0.540697 0.540697 0.540697 ZT20-23 0.634142 0.634142 0.634142