condition mean min max ZT0-3 0.59013025 0.490459 0.6898015 ZT4-7 0.44906 0.44906 0.44906 ZT8-11 0.323203 0.323203 0.323203 ZT12-15 0 0 0 ZT16-19 0.9576770000000001 0.9576770000000001 0.9576770000000001 ZT20-23 1.2046085 1.2046085 1.2046085