condition mean min max ZT0-3 1.0435845 0.4132695 1.6738994999999999 ZT4-7 1.237505 1.237505 1.237505 ZT8-11 3.12836 3.12836 3.12836 ZT12-15 0 0 0 ZT16-19 2.26566 2.26566 2.26566 ZT20-23 2.06722 2.06722 2.06722