Table 3.

Threshold effect analysis of TG/HDL on incident impaired glucose tolerance.

Outcome	Impaired glucose tolerance
	HR (95% CI)	P value
One-line linear Cox regression model	1.04 (1.02, 1.06)	<0.001
Two-piecewise linear Cox regression model
TG/HDL < 1.04	1.57 (1.42, 1.73)	<0.001
TG/HDL ≥ 1.04	1.00 (0.98, 1.02)	0.9558
The effect of 2 and 1 is different	0.64 (0.57, 0.71)	<0.0001
Likelihood ratio test	<0.001

Notes: adjusted for age, gender, BMI, smoking, drinking, family history of diabetes, ALT, AST, BUN, LDL, FPG, and TC.