condition mean min max ZT0-3 31.900000000000002 31.900000000000002 31.900000000000002 ZT4-7 2.9 2.9 2.9 ZT8-11 40.849999999999994 40.849999999999994 40.849999999999994 ZT12-15 22.75 22.75 22.75 ZT16-19 19.0 19.0 19.0 ZT20-23 47.650000000000006 47.650000000000006 47.650000000000006