Table 4.

The result of two-piecewise linear regression model

Incident NAFLD	HR (95% CI)	P
Fitting model by standard linear regression	1.010 (1.007–1.012)	<0.001
Fitting model by two-piecewise linear regression
Inflection point of GGT
≤26 U/L	1.104 (1.089–1.120)	<0.001
> 26 U/L	1.001 (0.999–1.004)	0.3640
P for log likelihood ratio test	<0.001

We adjusted age, gender, BMI, SBP, DBP, TC, TG, HDL-C, LDL-C, ALT, AST, ALP, ALB, GLB, TB, DBIL, BUN, Cr, UA, FBG

CI Confidence interval, HR hazard ratio, NAFLD non-alcoholic fatty liver disease, GGT γ-glutamyl transpeptidase