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Statistical analysis Principal component analysis (PCA) and Hierarchical cluster analysis (HCA) were conducted to analyze the dynamic changes in conventional chemical composition factors levels using SIMCA 14.1 software (Wu et al
Nicotine exerts an anti-inflammatory effect in a murine model of acute lung injury
Statistical analysis Cigarette butt densities, i.e., cigarette butts per square meter, were expressed as mean standard deviation and range, from minimum to maximum
Cox regression and Kaplan-Meier analysis were performed for predictors of FVA(+SCD) and smoking or never smoking groups, respectively
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