condition mean min max ZT0-3 36.05 36.05 36.05 ZT4-7 3.6 3.6 3.6 ZT8-11 14.799999999999999 14.799999999999999 14.799999999999999 ZT12-15 35.75 35.75 35.75 ZT16-19 12.9 12.9 12.9 ZT20-23 9.85 9.85 9.85