condition mean min max ZT0-3 8.654755 4.39886 12.91065 ZT4-7 0.5846210000000001 0.5846210000000001 0.5846210000000001 ZT8-11 0.8858975 0.8858975 0.8858975 ZT12-15 0 0 0 ZT16-19 3.361625 3.361625 3.361625 ZT20-23 1.453686 1.453686 1.453686