Factors associated with sarcopenia screened by finger-circle test among middle-aged and older adults: a population-based multisite cross-sectional survey in Japan

Table 2 Area under the receiver operating characteristic curves for the finger-circle (yubi-wakka) test

	Finger-circle test ^a			By finger-circle test (smaller) ^c
	Bigger	Just fits	Smaller	Sensitivity	Specificity	PPV	NPV	LR+	LR-	AUROC (95% CI)
Total (n = 525)
Sarcopenia, n ^b	11 (2.1)	21 (4.0)	17 (3.2)	34.7	87.6	22.4	92.9	2.8	0.7	0.666 (0.588 to 0.744)
Non-sarcopenia, n	223 (42.5)	194 (37.0)	59 (11.2)	34.7	87.6	22.4	92.9	2.8	0.7	0.666 (0.588 to 0.744)
Women (n = 436)
Sarcopenia, n ^b	6 (1.4)	14 (3.2)	13 (3.0)	39.4	87.1	20.0	94.6	3.1	0.7	0.691 (0.543 to 0.839)
Non-sarcopenia, n	183 (41.9)	168 (38.5)	52 (12.0)	39.4	87.1	20.0	94.6	3.1	0.7	0.691 (0.543 to 0.839)
Men (n = 89)
Sarcopenia, n ^b	5 (5.6)	7 (7.9)	4 (4.5)	25.0	90.4	36.4	84.6	2.6	0.8	0.641 (0.549 to 0.733)
Non-sarcopenia, n	40 (44.9)	26 (29.2)	7 (7.9)	25.0	90.4	36.4	84.6	2.6	0.8	0.641 (0.549 to 0.733)
< 65 years (n = 107)
Sarcopenia, n ^b	1 (0.9)	1 (0.9)	2 (1.9)	50.0	94.2	25.0	98.0	8.6	0.5	0.729 (0.459 to 0.999)
Non-sarcopenia, n	52 (48.6)	45 (42.1)	6 (5.6)	50.0	94.2	25.0	98.0	8.6	0.5	0.729 (0.459 to 0.999)
≥65 years (n = 418)
Sarcopenia, n ^b	10 (2.4)	20 (4.8)	15 (3.6)	33.3	86.5	22.1	91.4	2.3	0.8	0.653 (0.571 to 0.735)
Non-sarcopenia, n	171 (40.9)	149 (35.6)	53 (12.7)	33.3	86.5	22.1	91.4	2.3	0.8	0.653 (0.571 to 0.735)

AUROC area under the receiver operating characteristic curves, CI confidence interval, LR+ positive likelihood ratio, LR− negative likelihood ratio, NPV negative predictive value, PPV positive predictive value
^aCompare the size of the finger-circle to the thickness (circumference) of the thickest part of your calf (calf is smaller [smaller], calf and finger-circle are about the same size [same size], or calf is bigger [bigger])”
^bSarcopenia was defined by a skeletal muscle mass index (evaluated by the bioimpedance method) of < 7.0 kg/m² in men and < 5.7 kg/m² in women, in accordance with the AWGS 2019 Consensus
^cThose whose finger-circle test response was “smaller” were defined as having sarcopenia

ISSN: 1471-2458