condition mean min max ZT0-3 4.0702300000000005 4.0702300000000005 4.0702300000000005 ZT4-7 3.41898 3.41898 3.41898 ZT8-11 4.1894 4.1894 4.1894 ZT12-15 4.25818 4.25818 4.25818 ZT16-19 5.549545 5.549545 5.549545 ZT20-23 4.661415 4.661415 4.661415