condition mean min max ZT0-3 3.17089 2.32446 4.01732 ZT4-7 2.90216 2.90216 2.90216 ZT8-11 1.9977 1.9977 1.9977 ZT12-15 0 0 0 ZT16-19 4.13747 4.13747 4.13747 ZT20-23 7.9288799999999995 7.9288799999999995 7.9288799999999995