Classified status of smoking and quitting has different associations with dyslipidemia in residents in northeast China

Background: Various smoking status and high prevalence of dyslipidemia in residents exist in northeast China. However, associations of dyslipidemia with smoking status remain unclear. Methods: A total of 17,114 participants selected by a multistage stratified cluster random sampling design were enrolled from a cross-sectional study conducted in northeast China. Associations of dyslipidemia with smoking/ quitting status (smoking amount, smoking duration, and quitting duration) were investigated using multiple logistic regression. Results: Prevalence (39.2%) of dyslipidemia existed in residents in northeast China. Smoking amount was associated with dyslipidemia (1-10 cigarettes daily: OR = 1.19, 95% CI: 1.08-1.32; 11-20 cigarettes daily: OR = 1.29, 95% CI: 1.16-1.42; and over 20 cigarettes daily: OR = 1.51, 95% CI: 1.25-1.83). Smoking duration was associated with dyslipidemia risk (6-10 years: OR = 1.75, 95% CI: 1.51-2.03; 11-15 years: OR = 1.85, 95% CI: 1.51-2.26; and 15 years: OR = 1.12, 95% CI: 1.02-1.23). Quitting duration (1-5 years) was associated with dyslipidemia (OR = 1.26, 95% CI: 1.07-1.48); however, we found no statistically significant associations between dyslipidemia and quitting duration (over 6 years). Conclusions: Dyslipidemia risk is positively associated with smoking/quitting status. Smoking amount and smoking duration may co-determine dyslipidemia risk, and quitting duration (> 6 years) is necessary for reducing dyslipidemia risk.