condition mean min max ZT0-3 2.28162 1.75464 2.8086 ZT4-7 3.583185 3.583185 3.583185 ZT8-11 0.9596475 0.9596475 0.9596475 ZT12-15 0 0 0 ZT16-19 1.0105975 1.0105975 1.0105975 ZT20-23 1.62219 1.62219 1.62219