condition mean min max ZT0-3 477.5 477.5 477.5 ZT4-7 437.4 437.4 437.4 ZT8-11 350.9 350.9 350.9 ZT12-15 412.8 412.8 412.8 ZT16-19 423.1 423.1 423.1 ZT20-23 435.25 435.25 435.25