Risk of admissions through ED visits and annual increase in the associated medical costs (US$1000) attributable to extreme heat. The first panel shows the OR when using a case-crossover design with a conditional logistic regression. The second panel shows the ROR that was calculated as the OR of persons eligible for MA divided by the estimates of persons not eligible for MA. Error bars show 95% CIs for estimates of risk. The third panel shows the annual increase in medical costs. It was calculated as α × (OR – 1)/OR, where α is the baseline daily medical costs from 2010 to 2019 per 100 000 person-years. α was calculated among each study group divided by the total person-years for beneficiaries and multiplied by 100 000.