Table 3. Multivariable analysis of the relation between quartiles of GIP/GLP-1 and IMT_meanCCA/IMT_maxBulb.

	Quartiles of fasting GIP		Quartiles of postchallenge GIP*
	β (SE)	P	β (SE)	P
Associations between quartiles of GIP and IMTmeanCCA
Q1	Referent	—	Referent	—
Q2	0.003 (0.010)	0.758	0.020 (0.011)	0.059
Q3	0.013 (0.011)	0.233	0.012 (0.011)	0.260
Q4	0.023 (0.011)	0.032	0.015 (0.011)	0.180
P trend	0.008 (0.003)	0.021	0.004 (0.004)	0.305
Associations between quartiles of GIP and IMTmaxBulb
Q1	Referent	—	Referent	—
Q2	0.023 (0.018)	0.202	−0.010 (0.019)	0.599
Q3	0.016 (0.018)	0.388	−0.016 (0.020)	0.412
Q4	0.035 (0.019)	0.065	−0.008 (0.020)	0.683
P trend	0.010 (0.006)	0.105	0.002 (0.006)	0.761
Associations between quartiles of GLP-1 and IMTmeanCCA
Q1	Referent	—	Referent	—
Q2	0.002 (0.011)	0.828	−0.002 (0.011)	0.878
Q3	−0.001 (0.011)	0.898	−0.005 (0.011)	0.639
Q4	−0.007 (0.011)	0.541	−0.018 (0.011)	0.100
P trend	−0.003 (0.004)	0.450	−0.006 (0.006)	0.108
Associations between quartiles of GLP-1 and IMTmaxBulb
Q1	Referent	—	Referent	—
Q2	−0.031 (0.019)	0.115	−0.016 (0.020)	0.430
Q3	−0.032 (0.019)	0.103	−0.025 (0.019)	0.200
Q4	−0.038 (0.019)	0.047	−0.041 (0.020)	0.044
P trend	−0.007 (0.006)	0.222	−0.013 (0.006)	0.042

Data are unstandardized β-coefficients (1-SD increase of incretins per mm IMT_meanCCA or IMT_maxBulb) (β) and SEs. Q1, quartile with lowest values; Q4, quartile with highest values. Analyses of fasting incretins are adjusted for age, sex, BMI, SBP, smoking status, diabetes status, FPG, fasting insulin, HDL, triglycerides, AHT, and lipid-lowering treatment (model 2a). Analyses between postchallenge GIP and IMT_meanCCA are adjusted for age, sex, BMI, SBP, smoking status, diabetes status, postchallenge plasma glucose, postchallenge insulin, HDL, triglycerides, AHT, and lipid-lowering treatment (model 2b).

^*2 h postchallenge (at 120 min).