condition mean min max ZT0-3 27.3 27.3 27.3 ZT4-7 3.9 3.9 3.9 ZT8-11 4.65 4.65 4.65 ZT12-15 9.1 9.1 9.1 ZT16-19 25.45 25.45 25.45 ZT20-23 17.799999999999997 17.799999999999997 17.799999999999997