condition mean min max ZT0-3 41.1 41.1 41.1 ZT4-7 45.3 45.3 45.3 ZT8-11 38.400000000000006 38.400000000000006 38.400000000000006 ZT12-15 32.55 32.55 32.55 ZT16-19 37.85 37.85 37.85 ZT20-23 32.849999999999994 32.849999999999994 32.849999999999994