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 0.00577285 0.0 0.0115457 ZT16-19 0.008151183333333334 0.0 0.01630236666666667 ZT20-23 0 0 0