condition mean min max ZT0-3 0.8165055000000001 0.8165055000000001 0.8165055000000001 ZT4-7 0.517582 0.517582 0.517582 ZT8-11 0.648907 0.648907 0.648907 ZT12-15 2.97333 2.97333 2.97333 ZT16-19 2.45481 2.45481 2.45481 ZT20-23 1.90341 1.90341 1.90341