condition mean min max ZT0-3 25.2972 25.2972 25.2972 ZT4-7 18.888199999999998 18.888199999999998 18.888199999999998 ZT8-11 19.782899999999998 19.782899999999998 19.782899999999998 ZT12-15 20.09175 20.09175 20.09175 ZT16-19 30.582949999999997 30.582949999999997 30.582949999999997 ZT20-23 25.86205 25.86205 25.86205