condition mean min max ZT0-3 1.176829 1.176829 1.176829 ZT4-7 0.959155 0.959155 0.959155 ZT8-11 0.9852935 0.9852935 0.9852935 ZT12-15 1.087835 1.087835 1.087835 ZT16-19 1.200934 1.200934 1.200934 ZT20-23 0.8322765 0.8322765 0.8322765