Table 3.

Threshold effect analysis for the relationship between Dietary Inflammatory Index and serum Klotho concentrations among adults in NHANES 2007–2016^a

Models	serum Klotho concentrations
	β(95%CI)	P-value
Model I
One line slope	-4.63 (-7.61, -1.65)	0.002
Model II
Turning point (K)	-1.82 (-2.32, -0.80)
<—1.82 slope 1	-33.05 (-52.84, -13.27)	0.001
>—1.82 slope 2	-2.19 (-5.61, 1.24)	0.211
Slope 2 – Slope 1	30.87 (9.63, 52.11)	0.004
Predicted at 2.82	846.43 (834.62, 858.24)
Log likelihood ratio test	0.004b

Model I, linear analysis

Model II, non-linear analysis

Log likelihood ratio test: P-value < 0.05 means Model II is significantly different from Model I, which indicates a non-linear relationship

^aadjusted for age; sex; Race; Ratio of family income to poverty; BMI; alcohol intake; physical activity; smoking; eGFR

^bindicates that Model II is significantly different from Model I