condition mean min max ZT0-3 1.697147511 1.2943326800000001 2.099962342 ZT4-7 1.76032238175 1.3890785120000002 2.1315662515 ZT8-11 2.854394821 2.1464187345 3.5623709075 ZT12-15 4.2462223925 3.3238361995000005 5.1686085854999995 ZT16-19 3.5564900995 3.2967879795 3.8161922195 ZT20-23 4.74687747075 4.380729692 5.1130252495