condition mean min max ZT0-3 0.731875 0.0 1.46375 ZT4-7 2.627845 2.627845 2.627845 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 2.067595 2.067595 2.067595 ZT20-23 3.98791 3.98791 3.98791