condition mean min max ZT0-3 4.35 4.35 4.35 ZT4-7 21.4 21.4 21.4 ZT8-11 28.799999999999997 28.799999999999997 28.799999999999997 ZT12-15 4.75 4.75 4.75 ZT16-19 11.299999999999999 11.299999999999999 11.299999999999999 ZT20-23 9.05 9.05 9.05