condition mean min max ZT0-3 2.72404 2.39718 3.0509 ZT4-7 2.35557 2.35557 2.35557 ZT8-11 2.770855 2.770855 2.770855 ZT12-15 0 0 0 ZT16-19 6.907255 6.907255 6.907255 ZT20-23 4.24514 4.24514 4.24514