Figure 1 -.

Accurate numbers of critical care centers and services worldwide are unknown. Membership in the World Federation of Societies in Intensive and Critical Care Medicine is used as an extrapolation of possible services worldwide, with countries illustrated where membership Societies are fully developed (blue), those where existing membership is developing a professional Society (gray), and countries without Federation members (white). (Adapted with permission from World Federation of Societies of Intensive and Critical Care Medicine.¹⁹)