condition mean min max ZT0-3 66.395806 66.395806 66.395806 ZT4-7 98.2471315 98.2471315 98.2471315 ZT8-11 116.1280885 116.1280885 116.1280885 ZT12-15 139.73125499999998 139.73125499999998 139.73125499999998 ZT16-19 89.29749050000001 89.29749050000001 89.29749050000001 ZT20-23 181.55214949999998 181.55214949999998 181.55214949999998