condition mean min max ZT0-3 1.5782699999999998 1.5614599999999998 1.59508 ZT4-7 1.904815 1.904815 1.904815 ZT8-11 2.26333 2.26333 2.26333 ZT12-15 0 0 0 ZT16-19 2.740005 2.740005 2.740005 ZT20-23 2.60324 2.60324 2.60324