condition mean min max ZT0-3 4.14542 3.98546 4.3053799999999995 ZT4-7 1.47738 1.47738 1.47738 ZT8-11 0.639567 0.639567 0.639567 ZT12-15 0 0 0 ZT16-19 0.870566 0.870566 0.870566 ZT20-23 1.213965 1.213965 1.213965