Fig. 3.

Subgroup analyses of delirium risk with HRR index. Forrest plot of hazard ratios with 95% confidence intervals for each 1-SD decrease in HRR index predicting incident delirium based on subgroups of patients by age, sex, CVD risk, physical activity level, maximal METs achieved during exercise, use of HR-control drugs, and reaction time. “Lower/Higher” and “Slower/Faster” were dichotomized based on the median values. CVD = cardiovascular disease; HR = heart rate; HRR = heart rate response/recovery; MET = metabolic equivalent of task.