condition mean min max ZT0-3 0.64228325 0.548508 0.7360585 ZT4-7 0.6491015 0.6491015 0.6491015 ZT8-11 1.0746165 1.0746165 1.0746165 ZT12-15 0 0 0 ZT16-19 1.33913 1.33913 1.33913 ZT20-23 0.982226 0.982226 0.982226