condition mean min max ZT0-3 5.857631666666667 1.870165 10.504480000000001 ZT4-7 1.69254 1.69254 1.69254 ZT8-11 1.713765 1.713765 1.713765 ZT12-15 13.069895 8.72429 17.4155 ZT16-19 1.601015 1.601015 1.601015 ZT20-23 14.654900000000001 14.654900000000001 14.654900000000001