condition mean min max ZT0-3 11.582118 11.582118 11.582118 ZT4-7 12.910566 12.910566 12.910566 ZT8-11 16.3934725 16.3934725 16.3934725 ZT12-15 22.948543 22.948543 22.948543 ZT16-19 19.789828999999997 19.789828999999997 19.789828999999997 ZT20-23 16.314982999999998 16.314982999999998 16.314982999999998