condition mean min max ZT0-3 27.452066666666667 24.94115 28.77045 ZT4-7 28.25985 28.25985 28.25985 ZT8-11 12.8842 12.8842 12.8842 ZT12-15 28.518 28.4802 28.555799999999998 ZT16-19 28.1918 28.1918 28.1918 ZT20-23 25.25155 25.25155 25.25155