condition mean min max ZT0-3 26.7 26.7 26.7 ZT4-7 27.5 27.5 27.5 ZT8-11 35.6 35.6 35.6 ZT12-15 25.799999999999997 25.799999999999997 25.799999999999997 ZT16-19 35.1 35.1 35.1 ZT20-23 19.35 19.35 19.35