condition mean min max ZT0-3 36.599999999999994 36.599999999999994 36.599999999999994 ZT4-7 46.5 46.5 46.5 ZT8-11 27.85 27.85 27.85 ZT12-15 77.1 77.1 77.1 ZT16-19 73.55 73.55 73.55 ZT20-23 36.099999999999994 36.099999999999994 36.099999999999994