Sensitivity Analysis
Imputation of outliers in both influenza cohorts and their effect on the sample are shown in Supplemental Table 3. After model adjustment with the new clusters, there were no statistically significant differences in the odds or model-adjusted means of outcomes for the 2017/2018 influenza season (Supplemental Figure 1). For the 2018/2019 influenza season, after adjustment those in new cluster 1 had significantly higher odds of an intensive care unit stay compared with those in new cluster 2 (OR 4.62, 95%CI:1.34,15.97; Supplemental Figure 1).