condition mean min max ZT0-3 0.822636 0.822636 0.822636 ZT4-7 0.4005205 0.4005205 0.4005205 ZT8-11 0.827382 0.827382 0.827382 ZT12-15 1.278195 1.278195 1.278195 ZT16-19 1.762445 1.762445 1.762445 ZT20-23 1.23787 1.23787 1.23787