Table 3.

Analysis of threshold effects between the three indicators and muscle strength.

Characteristic	BRI	CI	WHtR
Break point (K)	3.55	1.27	0.51
< K-segment effect	3.60 (2.81, 4.39)	15.87 (7.85, 23.90)	62.46 (48.36, 76.55)
> K-segment effect	0.24 (0.10, 0.39)	−9.98 (−14.98, −4.98)	6.47 (2.85, 10.08)
Log-likelihood ratio test	<0.01	<0.01	<0.01

Analyses were adjusted for age, sex, ethnicity, marital status, alcohol consumption, hypertension, diabetes, special diet, total energy intake, coronary heart disease, and total cholesterol. *P < 0.05. BRI, Body Roundness Index; CI, Conicity Index; WHtR, waist-to-height ratio.