condition mean min max ZT0-3 1.468464 0.9703105000000001 2.0105565 ZT4-7 0.6794255 0.6794255 0.6794255 ZT8-11 1.67789 1.67789 1.67789 ZT12-15 3.405575 2.98523 3.82592 ZT16-19 2.9323949999999996 2.9323949999999996 2.9323949999999996 ZT20-23 3.15512 3.15512 3.15512