condition mean min max ZT0-3 52.495125 40.0921 64.89815 ZT4-7 23.96635 23.96635 23.96635 ZT8-11 4.95839 4.95839 4.95839 ZT12-15 0 0 0 ZT16-19 6.709885 6.709885 6.709885 ZT20-23 14.74345 14.74345 14.74345