condition mean min max ZT0-3 0.0270915 0.0 0.054183 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0691485 0.0691485 0.0691485 ZT20-23 0.0 0.0 0.0