condition mean min max ZT0-3 17.35 17.35 17.35 ZT4-7 38.4 38.4 38.4 ZT8-11 31.799999999999997 31.799999999999997 31.799999999999997 ZT12-15 19.4 19.4 19.4 ZT16-19 28.799999999999997 28.799999999999997 28.799999999999997 ZT20-23 26.650000000000002 26.650000000000002 26.650000000000002