condition mean min max ZT0-3 28.24865 28.24865 28.24865 ZT4-7 22.500999999999998 22.500999999999998 22.500999999999998 ZT8-11 21.495350000000002 21.495350000000002 21.495350000000002 ZT12-15 24.88925 24.88925 24.88925 ZT16-19 41.45655 41.45655 41.45655 ZT20-23 33.3072 33.3072 33.3072