Map created by the second and third components derived from the multiple correspondence analysis.

<p>Full legend: The horizontal axis, second component, can be interpreted as an index of the severity of the exacerbation or the acute COPD process, more acute (left side) vs. less acute (right side). The vertical axis, third component, can be interpreted as an index of the comorbidity status, more severe (bottom) vs. less severe (top). Black dots in the plane represent the categories of the active variables included in the multiple correspondence analysis, only the most representative ones were labeled. The closer the points are, stronger is the relationship between the categories. Relative positions of the subjects in this plane are represented by different colors, depending on the subtype provided by the cluster analysis. Large blue dots represent the relative position of the outcomes.