condition mean min max ZT0-3 18.209875 16.81325 19.6065 ZT4-7 17.6904 17.6904 17.6904 ZT8-11 2.7363299999999997 2.7363299999999997 2.7363299999999997 ZT12-15 0 0 0 ZT16-19 6.991135 6.991135 6.991135 ZT20-23 15.115950000000002 15.115950000000002 15.115950000000002