condition mean min max ZT0-3 0.026392333333333334 0.0 0.079177 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0766025 0.0766025 0.0766025 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.083429 0.083429 0.083429