condition mean min max ZT0-3 2.2688725 1.52681 3.010935 ZT4-7 0.77647 0.77647 0.77647 ZT8-11 3.037495 3.037495 3.037495 ZT12-15 0 0 0 ZT16-19 2.999615 2.999615 2.999615 ZT20-23 2.26421 2.26421 2.26421