condition mean min max ZT0-3 0.3019735 0.1586865 0.44526050000000006 ZT4-7 0.0637148 0.0637148 0.0637148 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.03133535 0.03133535 0.03133535 ZT20-23 0.0 0.0 0.0