condition mean min max ZT0-3 11.66220919475 9.015714689500001 14.308703699999999 ZT4-7 10.257265297250001 8.2360282635 12.278502331 ZT8-11 13.855841367499998 12.478681345 15.233001389999998 ZT12-15 33.456803895 19.39838829 47.5152195 ZT16-19 36.0367381625 34.93556017 37.137916155 ZT20-23 41.8402542775 40.954184595 42.72632396