condition mean min max ZT0-3 37.54533333333333 24.37925 46.038799999999995 ZT4-7 14.77 14.77 14.77 ZT8-11 22.07265 22.07265 22.07265 ZT12-15 30.256774999999998 28.872799999999998 31.64075 ZT16-19 32.34585 32.34585 32.34585 ZT20-23 48.76845 48.76845 48.76845