condition mean min max ZT0-3 3.1324899999999998 3.1324899999999998 3.1324899999999998 ZT4-7 6.10009 6.10009 6.10009 ZT8-11 1.1141475 1.1141475 1.1141475 ZT12-15 0.5449335 0.5449335 0.5449335 ZT16-19 1.0949045000000002 1.0949045000000002 1.0949045000000002 ZT20-23 1.43986 1.43986 1.43986