condition mean min max ZT0-3 490.1 490.1 490.1 ZT4-7 561.8 561.8 561.8 ZT8-11 507.65 507.65 507.65 ZT12-15 460.29999999999995 460.29999999999995 460.29999999999995 ZT16-19 556.2 556.2 556.2 ZT20-23 609.1 609.1 609.1