condition mean min max ZT0-3 24.17905 24.17905 24.17905 ZT4-7 22.293522 22.293522 22.293522 ZT8-11 22.7882375 22.7882375 22.7882375 ZT12-15 21.314401 21.314401 21.314401 ZT16-19 17.4264655 17.4264655 17.4264655 ZT20-23 16.207062 16.207062 16.207062