- The numeric values represent the proportion in the cluster (pooled across the 100 imputed datasets) that answered affirmatively to the corresponding question(s). The p-values were calculated with Chi-square test with the other clusters being the comparison group (e.g., for Cluster 4, Clusters 1–3 and Cluster 5 were grouped into one comparison group). a Denotes ordinal variables, below which are the proportions for each value. *p < 0.05. **p < 0.01. ***p < 0.001. ****p < 0.0001. mMRC: Modified Medical Research Council dyspnea scale (a score of ≥ 2 is defined as walking slower than people of the same age on ground level due to breathlessness, or having to stop for breath when walking in normal pace). SOB: shortness of breath
