condition mean min max ZT0-3 2.5264525 2.031485 3.02142 ZT4-7 2.38377 2.38377 2.38377 ZT8-11 2.530635 2.530635 2.530635 ZT12-15 0 0 0 ZT16-19 2.84582 2.84582 2.84582 ZT20-23 3.359845 3.359845 3.359845