a Yearly rate of YZ in Corynebacterium+Dolosigranulum cluster compared to the combined Others 3 clusters. The line in the middle of a boxplot represents the median value of Yearly rate of YZ; the line at bottom and top of a box represent 25 and 75 percentile of the data value. Dots above the vertical line represent outliers of the data. b Yearly rate of YZ in the four respiratory clusters. In a, b, each dot represents a participant in the cluster. Statistical significance of YZ rate differences between clusters was tested using Wilcoxon rank-sum test. c Corynebacterium + Dolosigranulum cluster has significantly lower probability than the combined other three clusters (Other) to develop >=2 episode of YZ (p = 0.02 by Cox Proportional-Hazards model). d Corynebacterium + Dolosigranulum cluster has significantly lower probability than the Moraxella cluster and the Staphylococcus cluster to develop >=2 episodes of YZ (p = 0.05 by Cox Proportional-Hazards model). The colors of the clusters in c, d, are as in a, b. Source data are provided as a Source Data file.