condition mean min max ZT0-3 11.8946 11.8946 11.8946 ZT4-7 10.78993 10.78993 10.78993 ZT8-11 8.10872 8.10872 8.10872 ZT12-15 8.536765 8.536765 8.536765 ZT16-19 12.5835 12.5835 12.5835 ZT20-23 14.4526 14.4526 14.4526