condition mean min max ZT0-3 23.36235 23.36235 23.36235 ZT4-7 15.876149999999999 15.876149999999999 15.876149999999999 ZT8-11 13.73825 13.73825 13.73825 ZT12-15 20.20295 20.20295 20.20295 ZT16-19 26.3014 26.3014 26.3014 ZT20-23 24.3305 24.3305 24.3305