condition mean min max ZT0-3 31.4357826775 21.977989285 40.89357607 ZT4-7 17.512698892499998 16.52329473 18.502103055 ZT8-11 11.7684029775 10.438708045 13.09809791 ZT12-15 4.598660695 3.7338636075 5.463457782500001 ZT16-19 5.02866808325 4.8728830015 5.184453165000001 ZT20-23 7.27311076475 6.2641429265 8.282078603