condition mean min max ZT0-3 0.27507333333333334 0.198431 0.423442 ZT4-7 0.194163 0.194163 0.194163 ZT8-11 0.0 0.0 0.0 ZT12-15 0.31199375 0.0 0.6239875 ZT16-19 0.7687204999999999 0.7687204999999999 0.7687204999999999 ZT20-23 1.0822035 1.0822035 1.0822035