condition mean min max ZT0-3 231.539749 231.539749 231.539749 ZT4-7 200.3736835 200.3736835 200.3736835 ZT8-11 267.6927245 267.6927245 267.6927245 ZT12-15 255.117012 255.117012 255.117012 ZT16-19 306.39280099999996 306.39280099999996 306.39280099999996 ZT20-23 344.37259500000005 344.37259500000005 344.37259500000005