condition mean min max ZT0-3 36.8338 36.8338 36.8338 ZT4-7 19.37065 19.37065 19.37065 ZT8-11 36.531800000000004 36.531800000000004 36.531800000000004 ZT12-15 27.130499999999998 27.130499999999998 27.130499999999998 ZT16-19 67.63555 67.63555 67.63555 ZT20-23 44.996399999999994 44.996399999999994 44.996399999999994