condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.01421948 0.0 0.02843896 ZT12-15 0.024277901833333334 0.0 0.04855580366666667 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0389767815 0.024874508000000004 0.05307905500000001