condition mean min max ZT0-3 34.400000000000006 34.400000000000006 34.400000000000006 ZT4-7 42.1 42.1 42.1 ZT8-11 45.599999999999994 45.599999999999994 45.599999999999994 ZT12-15 42.5 42.5 42.5 ZT16-19 69.19999999999999 69.19999999999999 69.19999999999999 ZT20-23 55.95 55.95 55.95