TABLE 1.

Most used instruments to identify and measure frailty

Frailty assessment instrument	Characteristics
Physical frailty
Fried's frailty phenotype	Five physical components of frailty: weakness (handgrip dynamometer); slow walking speed (5 m gait speed); exhaustion; unintentional weight loss; and low physical activity
Short physical performance battery	Encompasses slowness, weakness, and balance measured by a series of three timed physical performance tests (gait speed, chair stand test, and tandem balance)
Multidimensional frailty
Frailty Index of Accumulative Deficits (FI‐CD) (Rockwood's approach)	Assessed through the accumulation of health deficits across multiple domains, such as cognition, activities of daily living, comorbid diseases, deficits of social relations and social support, or abnormal laboratory results