condition mean min max ZT0-3 41.849999999999994 41.849999999999994 41.849999999999994 ZT4-7 43.9 43.9 43.9 ZT8-11 33.75 33.75 33.75 ZT12-15 26.9 26.9 26.9 ZT16-19 23.799999999999997 23.799999999999997 23.799999999999997 ZT20-23 32.6 32.6 32.6