condition mean min max ZT0-3 0.0083642 0.0 0.0167284 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0671573 0.0671573 0.0671573 ZT12-15 0 0 0 ZT16-19 0.03298865 0.03298865 0.03298865 ZT20-23 0.0 0.0 0.0