condition mean min max ZT0-3 1630.6 1630.6 1630.6 ZT4-7 1964.6 1964.6 1964.6 ZT8-11 1977.55 1977.55 1977.55 ZT12-15 2035.6999999999998 2035.6999999999998 2035.6999999999998 ZT16-19 2091.3999999999996 2091.3999999999996 2091.3999999999996 ZT20-23 1838.55 1838.55 1838.55