condition mean min max ZT0-3 11.721608333333334 9.162825 13.443100000000001 ZT4-7 7.7057 7.7057 7.7057 ZT8-11 13.219999999999999 13.219999999999999 13.219999999999999 ZT12-15 12.016225 10.969000000000001 13.06345 ZT16-19 8.25787 8.25787 8.25787 ZT20-23 11.7983 11.7983 11.7983