condition mean min max ZT0-3 24.803376 24.803376 24.803376 ZT4-7 19.697764 19.697764 19.697764 ZT8-11 15.643986 15.643986 15.643986 ZT12-15 19.1893935 19.1893935 19.1893935 ZT16-19 15.882825 15.882825 15.882825 ZT20-23 17.9004025 17.9004025 17.9004025