condition mean min max ZT0-3 0.213976 0.0 0.427952 ZT4-7 8.24202 8.24202 8.24202 ZT8-11 27.256500000000003 27.256500000000003 27.256500000000003 ZT12-15 0 0 0 ZT16-19 2.9435149999999997 2.9435149999999997 2.9435149999999997 ZT20-23 3.394195 3.394195 3.394195