condition mean min max ZT0-3 1.4233699999999998 1.4233699999999998 1.4233699999999998 ZT4-7 1.36762 1.36762 1.36762 ZT8-11 0.968308 0.968308 0.968308 ZT12-15 1.03388 1.03388 1.03388 ZT16-19 0.888733 0.888733 0.888733 ZT20-23 0.9066715 0.9066715 0.9066715