condition mean min max ZT0-3 0.03138675 0.03138675 0.03138675 ZT4-7 0.009663875 0.009663875 0.009663875 ZT8-11 0.0254331 0.0254331 0.0254331 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0