condition mean min max ZT0-3 10.866723 10.866723 10.866723 ZT4-7 13.940925 13.940925 13.940925 ZT8-11 11.6480745 11.6480745 11.6480745 ZT12-15 13.1809265 13.1809265 13.1809265 ZT16-19 11.416551 11.416551 11.416551 ZT20-23 12.422599000000002 12.422599000000002 12.422599000000002