condition mean min max ZT0-3 39.3888 39.3888 39.3888 ZT4-7 31.44005 31.44005 31.44005 ZT8-11 31.38495 31.38495 31.38495 ZT12-15 29.10695 29.10695 29.10695 ZT16-19 45.82585 45.82585 45.82585 ZT20-23 41.99595 41.99595 41.99595