condition mean min max ZT0-3 32.15528333333333 26.5973 37.5179 ZT4-7 18.97255 18.97255 18.97255 ZT8-11 22.92085 22.92085 22.92085 ZT12-15 30.714125000000003 28.325000000000003 33.10325 ZT16-19 35.74195 35.74195 35.74195 ZT20-23 50.416799999999995 50.416799999999995 50.416799999999995