condition mean min max ZT0-3 3.0336875 2.825655 3.24172 ZT4-7 2.58073 2.58073 2.58073 ZT8-11 2.745195 2.745195 2.745195 ZT12-15 0 0 0 ZT16-19 3.3075799999999997 3.3075799999999997 3.3075799999999997 ZT20-23 3.412535 3.412535 3.412535