condition mean min max ZT0-3 457.7 457.7 457.7 ZT4-7 427.6 427.6 427.6 ZT8-11 456.1 456.1 456.1 ZT12-15 459.54999999999995 459.54999999999995 459.54999999999995 ZT16-19 475.65 475.65 475.65 ZT20-23 555.5 555.5 555.5