condition mean min max ZT0-3 22.9738 18.7352 26.367449999999998 ZT4-7 17.2901 17.2901 17.2901 ZT8-11 19.36055 19.36055 19.36055 ZT12-15 21.514375 19.134149999999998 23.8946 ZT16-19 22.1595 22.1595 22.1595 ZT20-23 26.81105 26.81105 26.81105