Table 4.

Linear Regression Analysis Between Skin Autofluorescence (SAF) and Frailty Index in the Total Population and for the Subgroup RS-III

	Standardized Coefficient, B	Unstandardized Coefficient, B (95% CI)	p Value
Model 1	0.127	0.019 (0.013–0.025)	1.9 × 10−10
Model 2	0.116	0.017(0.011–0.023)	1.3 × 10−8
Model 1 (RS-III subgroup)	0.162	0.026 (0.016–0.036)	3.9 × 10−7
Model 2 (RS-III subgroup)	0.143	0.023 (0.013–0.033)	1.2 × 10−5

Notes: Model 1: Frailty index ~ SAF + age + sex + RS-cohorts. Model 2: Model 1 + smoking + educational level. All bold p-values are <.05 denoting significant results.