Table 4.

Association between serum DPP4 concentration and invasive mechanical ventilation in COVID-19 patients.

	Odds ratio [95% confidence interval]	p
Unadjusted	0.970 [0.949–0.992]	0.008
Model 1	0.971 [0.949–0.994]	0.013
Model 2	0.973 [0.951–0.996]	0.022
Model 3	0.974 [0.951–0.997]	0.025
Model 4	0.972 [0.949–0.996]	0.021
Model 5	0.974 [0.950–0.998]	0.031

Model 1: adjusted for age > 60 years.

Model 2: Model 1 + adjusted for sex.

Model 3: Model 2 + adjusted for body mass index.

Model 4: Model 3 + adjusted for type 2 diabetes mellitus.

Model 5: Model 4 + hypertension.