Fig. 4

Associations of continuous TyG index and incidence of pre-frail and frailstatus transition. All the adjusted models included covariates of age, sex, BMI, residence, marriage, education, habits of smoking and drinking, physical activity, CVD, hypertension, dyslipidemia, diabetes mellitus, cancer, lung disease, stroke, kidney disease, medications, and SBP. TyG index, triglyceride-glucose index; BMI, body mass index; CVD, cardiovascular disease; SBP, systolic blood pressure.