condition mean min max ZT0-3 15.49052708175 11.5372635935 19.44379057 ZT4-7 2.7954609135 2.0093116395 3.5816101875 ZT8-11 1.2996634462499999 1.2226776385 1.376649254 ZT12-15 0.8503631302499999 0.5954699899999999 1.1052562705 ZT16-19 0.37914511949999996 0.2325745145 0.5257157244999999 ZT20-23 1.07306649575 0.837855193 1.3082777985000003