condition mean min max ZT0-3 0.05300265 0.0327873 0.073218 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0794147625 0.029249724999999997 0.1295798 ZT16-19 0.0538359 0.035263666666666665 0.07240813333333333 ZT20-23 0 0 0