condition mean min max ZT0-3 8.806083333333333 0.97128 13.96695 ZT4-7 2.557915 2.557915 2.557915 ZT8-11 0.0 0.0 0.0 ZT12-15 0.4886425 0.0 0.977285 ZT16-19 1.593705 1.593705 1.593705 ZT20-23 3.663615 3.663615 3.663615