condition mean min max ZT0-3 2061.822308 2061.822308 2061.822308 ZT4-7 2879.4084555 2879.4084555 2879.4084555 ZT8-11 1714.1844515 1714.1844515 1714.1844515 ZT12-15 1786.814558 1786.814558 1786.814558 ZT16-19 1169.347069 1169.347069 1169.347069 ZT20-23 1017.064325 1017.064325 1017.064325