condition mean min max ZT0-3 0.2517085 0.2517085 0.2517085 ZT4-7 0.17978149999999998 0.17978149999999998 0.17978149999999998 ZT8-11 0.18841200000000002 0.18841200000000002 0.18841200000000002 ZT12-15 0.231904 0.231904 0.231904 ZT16-19 0.3371275 0.3371275 0.3371275 ZT20-23 0.31529700000000005 0.31529700000000005 0.31529700000000005