Intrinsic capacity and loneliness, according to sex, in an upper-middle income country: insights from the ELSI-Brazil cohort.

Objectives: To investigate the association between loneliness and intrinsic capacity, a multidimensional indicator of healthy ageing, in Brazilians aged ≥50 years.

Method: This cross-sectional study used baseline data from 7,123 participants of the nationally representative Brazilian Longitudinal Study of Aging (ELSI-Brazil) (2015-2016). Intrinsic capacity (IC) (sensory, mobility, psychological, cognitive, and vitality), was determined using a validated composite z-score (higher scores = better capacity).