condition mean min max ZT0-3 5.761285 5.7321550000000006 5.790414999999999 ZT4-7 5.1993100000000005 5.1993100000000005 5.1993100000000005 ZT8-11 4.89256 4.89256 4.89256 ZT12-15 0 0 0 ZT16-19 6.9431650000000005 6.9431650000000005 6.9431650000000005 ZT20-23 6.112030000000001 6.112030000000001 6.112030000000001