condition mean min max ZT0-3 22.65 22.65 22.65 ZT4-7 37.1 37.1 37.1 ZT8-11 31.799999999999997 31.799999999999997 31.799999999999997 ZT12-15 47.7 47.7 47.7 ZT16-19 24.35 24.35 24.35 ZT20-23 3.25 3.25 3.25