condition mean min max ZT0-3 1.5929316295 0.99485716 2.191006099 ZT4-7 5.03203197575 3.83846769 6.225596261500001 ZT8-11 7.156970929 7.0642341605 7.2497076975 ZT12-15 5.465540911750001 5.113413659500001 5.817668164 ZT16-19 4.94138415275 4.4422736595 5.440494646 ZT20-23 7.082614123999999 6.860247511499999 7.304980736499999