Figure 6. Subgroup analysis of chronic diseases and odds of mortality during the 2021 extreme heat event (EHE) . Odds ratios (ORs) and 95% confidence intervals, derived from conditional logistic regression, for the heat-related (X30, red), pending (R99, blue), and non-heat-related (not X30 or R99, green) cause of death subgroups. Each subgroup is compared with all typical weather deaths. Panel (A) shows the odds of death during the EHE among those with specific chronic diseases (adjusted for age, sex, and all other chronic diseases). Panel (B) shows the odds of death during the EHE associated with the burden of chronic diseases per person (adjusted for age and sex).