condition mean min max ZT0-3 0.212784 0.212784 0.212784 ZT4-7 0.5871934999999999 0.5871934999999999 0.5871934999999999 ZT8-11 0.31011500000000003 0.31011500000000003 0.31011500000000003 ZT12-15 0.069848 0.069848 0.069848 ZT16-19 0.262839 0.262839 0.262839 ZT20-23 0.0 0.0 0.0