condition mean min max ZT0-3 0.516694 0.463617 0.569771 ZT4-7 0.7222314999999999 0.7222314999999999 0.7222314999999999 ZT8-11 0.5996 0.5996 0.5996 ZT12-15 0 0 0 ZT16-19 0.4869345 0.4869345 0.4869345 ZT20-23 0.4644965 0.4644965 0.4644965