condition mean min max ZT0-3 0.730935 0.0 2.192805 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 1.6214175 0.0 3.242835 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0