condition mean min max ZT0-3 19.047379392499998 17.572026085 20.5227327 ZT4-7 16.839313725 15.387987103333334 18.290640346666667 ZT8-11 22.007599368333334 17.75586518 26.259333556666668 ZT12-15 22.764467175 21.67777034 23.851164009999998 ZT16-19 23.099635988333333 22.544413176666666 23.6548588 ZT20-23 23.328782160000003 23.18713637 23.47042795