condition mean min max ZT0-3 2136.6122219999997 2136.6122219999997 2136.6122219999997 ZT4-7 2001.942222 2001.942222 2001.942222 ZT8-11 1896.2849999999999 1896.2849999999999 1896.2849999999999 ZT12-15 1793.751111 1793.751111 1793.751111 ZT16-19 1894.1833333333334 1894.1833333333334 1894.1833333333334 ZT20-23 2268.768889 2268.768889 2268.768889