TABLE 1.

Current definitions of sarcopenia

	EWGSOP2 [ 24 ]	SCWD [ 25 ]	SDOC [ 26 ]
Probable sarcopenia	Low muscle strength
Sarcopenia	Low muscle strength + low muscle quantity/quality	Low muscle strength + low muscle quantity/quality	Low muscle strength + low physical performance
Severe sarcopenia	Low muscle strength + low muscle quantity/quality + low physical performance
Primary sarcopenia	Age-related, with no other evident specific cause	Age-related, with no other evident specific cause
Secondary sarcopenia	Secondary to a systemic disease (e.g. chronic respiratory disease)	Secondary to a systemic disease (e.g. chronic respiratory disease)

EWGSOP: European Working Group in Sarcopenia in Older People; SCWD: Society of Sarcopenia, Cachexia and Wasting Disorders; SDOC: Sarcopenia Definition and Outcomes Consortium.