condition mean min max ZT0-3 3.2975125 2.79833 3.796695 ZT4-7 1.8890799999999999 1.8890799999999999 1.8890799999999999 ZT8-11 2.043035 2.043035 2.043035 ZT12-15 0 0 0 ZT16-19 5.800285000000001 5.800285000000001 5.800285000000001 ZT20-23 5.61759 5.61759 5.61759