condition mean min max ZT0-3 1540.6999999999998 1540.6999999999998 1540.6999999999998 ZT4-7 1828.5 1828.5 1828.5 ZT8-11 1790.9 1790.9 1790.9 ZT12-15 1814.75 1814.75 1814.75 ZT16-19 1737.7 1737.7 1737.7 ZT20-23 1598.9 1598.9 1598.9