condition mean min max ZT0-3 664.75 664.75 664.75 ZT4-7 581.5 581.5 581.5 ZT8-11 500.25 500.25 500.25 ZT12-15 479.0 479.0 479.0 ZT16-19 615.45 615.45 615.45 ZT20-23 739.45 739.45 739.45