condition mean min max ZT0-3 2293.55 2293.55 2293.55 ZT4-7 1709.7 1709.7 1709.7 ZT8-11 1717.5 1717.5 1717.5 ZT12-15 1780.25 1780.25 1780.25 ZT16-19 1813.1999999999998 1813.1999999999998 1813.1999999999998 ZT20-23 2062.4 2062.4 2062.4