condition mean min max ZT0-3 12.021272 12.021272 12.021272 ZT4-7 11.1861245 11.1861245 11.1861245 ZT8-11 11.770082 11.770082 11.770082 ZT12-15 10.463894 10.463894 10.463894 ZT16-19 11.1473795 11.1473795 11.1473795 ZT20-23 10.8406485 10.8406485 10.8406485