Developing an Exportable, Valid, Open-Access Measure of Intrinsic Functional Capacity for Assessing Reserve and Resilience in Aging

Intrinsic functional capacity is a WHO-supported multidimensional aging framework that captures the sum of all mental and physical capabilities of the individual. We modeled IFC in the Dunedin Study (N=1037, Age=45), yielding a well-fitting bifactor model with 1 general factor (IFC) and 5 specific subfactors (locomotor, cognitive, psychological, sensory, vitality).