Fig. 3.

Treemaps of weighting stratified by U.S. Census division and rural/teaching hospital status. a, b: The treemaps provide a perspective of population size (box size) across region and hospital characteristic to describe the target population. The average size of the post-stratification weights used for each observation within Get With The Guideline-Stroke using the post-stratification approach. The more yellow and red regions of the treemaps highlight under-represented populations that required larger relative weights to model the target national population