condition mean min max ZT0-3 1.51306314575 1.3761192945 1.650006997 ZT4-7 2.4825064064999998 2.0256107795 2.9394020335 ZT8-11 4.6683237245 4.2471105940000005 5.089536855 ZT12-15 5.43907603675 4.8770483865 6.001103687 ZT16-19 7.4712303775 5.5291907380000005 9.413270017 ZT20-23 11.21887019175 10.4079183035 12.02982208