condition mean min max ZT0-3 29.95 29.95 29.95 ZT4-7 15.9 15.9 15.9 ZT8-11 23.85 23.85 23.85 ZT12-15 29.45 29.45 29.45 ZT16-19 28.799999999999997 28.799999999999997 28.799999999999997 ZT20-23 48.099999999999994 48.099999999999994 48.099999999999994