condition mean min max ZT0-3 4.199999999999999 4.199999999999999 4.199999999999999 ZT4-7 3.8 3.8 3.8 ZT8-11 2.45 2.45 2.45 ZT12-15 29.65 29.65 29.65 ZT16-19 19.9 19.9 19.9 ZT20-23 4.85 4.85 4.85