condition mean min max ZT0-3 3.6025775 3.595035 3.61012 ZT4-7 3.530285 3.530285 3.530285 ZT8-11 3.879435 3.879435 3.879435 ZT12-15 0 0 0 ZT16-19 5.16606 5.16606 5.16606 ZT20-23 3.1873 3.1873 3.1873