condition mean min max ZT0-3 47.099999999999994 47.099999999999994 47.099999999999994 ZT4-7 4.4 4.4 4.4 ZT8-11 13.899999999999999 13.899999999999999 13.899999999999999 ZT12-15 55.599999999999994 55.599999999999994 55.599999999999994 ZT16-19 32.05 32.05 32.05 ZT20-23 29.5 29.5 29.5