condition mean min max ZT0-3 159.385903 159.385903 159.385903 ZT4-7 151.3895005 151.3895005 151.3895005 ZT8-11 134.39323149999998 134.39323149999998 134.39323149999998 ZT12-15 130.122008 130.122008 130.122008 ZT16-19 78.786039 78.786039 78.786039 ZT20-23 62.7335925 62.7335925 62.7335925