condition mean min max ZT0-3 3.35 3.35 3.35 ZT4-7 26.8 26.8 26.8 ZT8-11 37.4 37.4 37.4 ZT12-15 4.95 4.95 4.95 ZT16-19 43.099999999999994 43.099999999999994 43.099999999999994 ZT20-23 8.2 8.2 8.2