condition mean min max ZT0-3 0.883157 0.883157 0.883157 ZT4-7 0.6253845 0.6253845 0.6253845 ZT8-11 0.7035899999999999 0.7035899999999999 0.7035899999999999 ZT12-15 0.804682 0.804682 0.804682 ZT16-19 1.1107399999999998 1.1107399999999998 1.1107399999999998 ZT20-23 1.024725 1.024725 1.024725