TTR and chronic obstructive pulmonary disease: After performing stepwise regression analysis and excluding non-statistically significant independent variables, the results revealed that when the following 13 factors were included in the linear regression model: age, NIHSS score, dysphagia, COPD, atrial fibrillation, cardiac insufficiency, renal insufficiency, hepatic insufficiency, FBG, CRP, WBC, NEUT% and prealbumin, the AIC value reached its lowest point at 201,119.