condition mean min max ZT0-3 0.08706975 0.0 0.1741395 ZT4-7 0.23825449999999998 0.23825449999999998 0.23825449999999998 ZT8-11 0.713925 0.713925 0.713925 ZT12-15 0 0 0 ZT16-19 0.2338885 0.2338885 0.2338885 ZT20-23 0.469641 0.469641 0.469641