condition mean min max ZT0-3 19.25 19.25 19.25 ZT4-7 9.6 9.6 9.6 ZT8-11 3.8000000000000003 3.8000000000000003 3.8000000000000003 ZT12-15 27.15 27.15 27.15 ZT16-19 4.199999999999999 4.199999999999999 4.199999999999999 ZT20-23 3.5 3.5 3.5