condition mean min max ZT0-3 0.06566021666666666 0.03420335 0.0985788 ZT4-7 0.0325573 0.0325573 0.0325573 ZT8-11 0.0 0.0 0.0 ZT12-15 0.03478185 0.03298795 0.03657575 ZT16-19 0.06275825 0.06275825 0.06275825 ZT20-23 0.0360401 0.0360401 0.0360401