condition mean min max ZT0-3 1.0 1.0 1.0 ZT4-7 0.9 0.9 0.9 ZT8-11 15.45 15.45 15.45 ZT12-15 4.55 4.55 4.55 ZT16-19 2.75 2.75 2.75 ZT20-23 18.799999999999997 18.799999999999997 18.799999999999997