Figure 2From: The unique alterations of hippocampus and cognitive impairment in chronic obstructive pulmonary diseaseBox plot of the hippocampal volumes in control group and mild-to-moderate and severe COPD groups. The horizontal line through each box represents the median. The ends of each box represent the 25th and 75th percentile locations, and the lines represent the range of the date. The cross of each box represents the mean.* * P < 0.01.Back to article page