condition mean min max ZT0-3 0.247764597 0.0 0.495529194 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.2413444265 0.0 0.482688853 ZT16-19 0.1749118531666667 0.0 0.3498237063333334 ZT20-23 0.0 0.0 0.0