condition mean min max ZT0-3 19.542324999999998 16.9538 22.13085 ZT4-7 9.015245 9.015245 9.015245 ZT8-11 10.214424999999999 10.214424999999999 10.214424999999999 ZT12-15 0 0 0 ZT16-19 13.86355 13.86355 13.86355 ZT20-23 15.09555 15.09555 15.09555