condition mean min max ZT0-3 0.0105916 0.0105916 0.0105916 ZT4-7 0.0682431 0.0682431 0.0682431 ZT8-11 0.05773825 0.05773825 0.05773825 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.043268600000000004 0.043268600000000004 0.043268600000000004