condition mean min max ZT0-3 2.04562 1.9742899999999999 2.11695 ZT4-7 1.49372 1.49372 1.49372 ZT8-11 2.1434 2.1434 2.1434 ZT12-15 0 0 0 ZT16-19 2.32959 2.32959 2.32959 ZT20-23 3.24962 3.24962 3.24962