condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.088944 0.0 0.177888 ZT16-19 0.06862 0.06862 0.06862 ZT20-23 0.0 0.0 0.0