condition mean min max ZT0-3 13.4993525 12.569804999999999 14.4289 ZT4-7 5.22442 5.22442 5.22442 ZT8-11 3.485805 3.485805 3.485805 ZT12-15 0 0 0 ZT16-19 6.3575800000000005 6.3575800000000005 6.3575800000000005 ZT20-23 9.55879 9.55879 9.55879