condition mean min max ZT0-3 12.406134 12.406134 12.406134 ZT4-7 13.093197 13.093197 13.093197 ZT8-11 13.492661 13.492661 13.492661 ZT12-15 14.1271895 14.1271895 14.1271895 ZT16-19 13.7856735 13.7856735 13.7856735 ZT20-23 13.4539915 13.4539915 13.4539915