Logistic regression analyses assessing the presence of diabetic retinopathy (DR) and maculopathy (DMac) with four respiratory parameters.

<p>Model 1: unadjusted.</p><p>Model 2: adjusted for age, gender, ethnicity.</p><p>Model 3: further adjusted for diabetes mellitus duration, insulin treatment, HbA_1c, hypertension, and coronary artery disease.</p>*<p>p<0.05;</p>**<p>p<0.01.