condition mean min max ZT0-3 0.5889393833333333 0.21509414999999998 1.21549 ZT4-7 0.8489805 0.8489805 0.8489805 ZT8-11 0.6693505 0.6693505 0.6693505 ZT12-15 0.632405 0.522648 0.742162 ZT16-19 0.59179 0.59179 0.59179 ZT20-23 0.359884 0.359884 0.359884