GCG and congenital bilateral aplasia of vas deferens from CFTR mutation: Thus, GLP-1 may be associated with CAVD; as expected, multivariable regression analysis found that GLP-1 was a negative independent factor for CAVD (OR = 0.922; 95% CI, 0.887–0.958) (Table 3) and significantly weakened the odds risk of CAVD.