condition mean min max ZT0-3 1880.3999999999999 1880.3999999999999 1880.3999999999999 ZT4-7 1927.8 1927.8 1927.8 ZT8-11 1996.1999999999998 1996.1999999999998 1996.1999999999998 ZT12-15 1794.3 1794.3 1794.3 ZT16-19 1962.55 1962.55 1962.55 ZT20-23 1742.1 1742.1 1742.1