condition mean min max ZT0-3 2.70071 2.317815 3.083605 ZT4-7 89.66805 89.66805 89.66805 ZT8-11 78.8664 78.8664 78.8664 ZT12-15 0 0 0 ZT16-19 4.28584 4.28584 4.28584 ZT20-23 4.8426350000000005 4.8426350000000005 4.8426350000000005