condition mean min max ZT0-3 29.914949999999997 29.84985 29.98005 ZT4-7 35.5813 35.5813 35.5813 ZT8-11 12.089500000000001 12.089500000000001 12.089500000000001 ZT12-15 0 0 0 ZT16-19 22.2354 22.2354 22.2354 ZT20-23 30.58765 30.58765 30.58765