condition mean min max ZT0-3 1.8185466666666668 1.0869 3.254915 ZT4-7 2.16593 2.16593 2.16593 ZT8-11 0.0 0.0 0.0 ZT12-15 1.1657175 0.0 2.331435 ZT16-19 1.08224 1.08224 1.08224 ZT20-23 3.6175300000000004 3.6175300000000004 3.6175300000000004