condition mean min max ZT0-3 45.449999999999996 45.449999999999996 45.449999999999996 ZT4-7 47.3 47.3 47.3 ZT8-11 81.0 81.0 81.0 ZT12-15 36.3 36.3 36.3 ZT16-19 63.400000000000006 63.400000000000006 63.400000000000006 ZT20-23 46.849999999999994 46.849999999999994 46.849999999999994