condition mean min max ZT0-3 25.8 25.8 25.8 ZT4-7 33.7 33.7 33.7 ZT8-11 4.2 4.2 4.2 ZT12-15 17.15 17.15 17.15 ZT16-19 34.599999999999994 34.599999999999994 34.599999999999994 ZT20-23 3.55 3.55 3.55