condition mean min max ZT0-3 0.80210830525 0.45171892700000005 1.1524976835 ZT4-7 2.3387843855 2.100374878 2.577193893 ZT8-11 1.92504552725 1.644424533 2.2056665215 ZT12-15 1.0523936370000002 0.8944034540000001 1.21038382 ZT16-19 1.1372757295 0.77209869 1.502452769 ZT20-23 3.73047972 2.8243826645 4.6365767755