condition mean min max ZT0-3 36.079550000000005 32.739850000000004 39.419250000000005 ZT4-7 21.40535 21.40535 21.40535 ZT8-11 14.1936 14.1936 14.1936 ZT12-15 0 0 0 ZT16-19 23.1375 23.1375 23.1375 ZT20-23 27.32905 27.32905 27.32905