condition mean min max ZT0-3 3018.806853 3018.806853 3018.806853 ZT4-7 2818.655277 2818.655277 2818.655277 ZT8-11 1791.4595515 1791.4595515 1791.4595515 ZT12-15 1462.1920925 1462.1920925 1462.1920925 ZT16-19 279.69065 279.69065 279.69065 ZT20-23 178.8792665 178.8792665 178.8792665