condition mean min max ZT0-3 35.87564456 34.020410170000005 37.73087895 ZT4-7 26.804339142499998 25.654621184999996 27.9540571 ZT8-11 18.820709685 18.506115455 19.135303915 ZT12-15 22.2573191525 21.38547684 23.129161465 ZT16-19 47.5807036675 46.845591420000005 48.315815915 ZT20-23 55.90358669 54.088519094999995 57.718654285