condition mean min max ZT0-3 1.33957565625 1.304230565 1.3749207475 ZT4-7 1.98448582675 1.5897821495 2.379189504 ZT8-11 3.78034033325 2.7765565875 4.784124079 ZT12-15 5.458723968499999 4.1707316965 6.7467162405 ZT16-19 2.2122755099999996 2.1392734504999997 2.2852775695 ZT20-23 3.29530638525 3.0457940260000003 3.5448187444999997