condition mean min max ZT0-3 2.13919 1.872875 2.405505 ZT4-7 1.930855 1.930855 1.930855 ZT8-11 3.14704 3.14704 3.14704 ZT12-15 0 0 0 ZT16-19 3.515635 3.515635 3.515635 ZT20-23 3.046075 3.046075 3.046075