condition mean min max ZT0-3 14.372399999999999 14.372399999999999 14.372399999999999 ZT4-7 10.44211 10.44211 10.44211 ZT8-11 10.724900000000002 10.724900000000002 10.724900000000002 ZT12-15 15.31865 15.31865 15.31865 ZT16-19 16.72565 16.72565 16.72565 ZT20-23 15.35315 15.35315 15.35315