condition mean min max ZT0-3 3.8356235 0.9913505 8.602475 ZT4-7 13.46105 13.46105 13.46105 ZT8-11 9.27779 9.27779 9.27779 ZT12-15 3.2252699999999996 2.25181 4.198729999999999 ZT16-19 2.54685 2.54685 2.54685 ZT20-23 0.9258145 0.9258145 0.9258145