condition mean min max ZT0-3 0.0657401685 0.0 0.131480337 ZT4-7 1.4145977745 0.0 2.829195549 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.12527770316666667 0.0 0.25055540633333334