condition mean min max ZT0-3 1970.6999999999998 1970.6999999999998 1970.6999999999998 ZT4-7 1616.1 1616.1 1616.1 ZT8-11 1707.85 1707.85 1707.85 ZT12-15 1829.6999999999998 1829.6999999999998 1829.6999999999998 ZT16-19 2041.25 2041.25 2041.25 ZT20-23 2041.4499999999998 2041.4499999999998 2041.4499999999998