condition mean min max ZT0-3 0.089033 0.0 0.178066 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0116303375 0.0 0.023260675 ZT16-19 0.017259833333333332 0.0 0.034519666666666664 ZT20-23 0 0 0