condition mean min max ZT0-3 27.87765 27.87765 27.87765 ZT4-7 25.797 25.797 25.797 ZT8-11 15.52135 15.52135 15.52135 ZT12-15 14.0588 14.0588 14.0588 ZT16-19 14.044 14.044 14.044 ZT20-23 25.41005 25.41005 25.41005