condition mean min max ZT0-3 2.4 2.4 2.4 ZT4-7 1.9 1.9 1.9 ZT8-11 4.6 4.6 4.6 ZT12-15 3.5 3.5 3.5 ZT16-19 24.75 24.75 24.75 ZT20-23 12.049999999999999 12.049999999999999 12.049999999999999