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Therefore, 57 WP smokers, 30 S-DI, 51 S-NI and 44 non-smokers were studied. PFT values and age are expressed as means?��?standard deviation, and RS data are expressed as the percentage of subjects in each group experiencing that symptom. The data for all three groups of smokers were normally distributed, as assessed by the one-sample Kolmogorov�CSmirnov test. Differences in the frequency of symptoms between the four groups were analysed using the chi-square test. The mean PFT values were compared between groups by one-way analysis of variance followed by the Tukey�CKramer post test. Correlations of PFT values and RS with duration and quantity of smoking were assessed by least squares regression. A two-sided P-value criterion for statistical significance. All analyses were this website performed using SPSS version 11.5 software (SPSS Inc., Chicago, IL, USA). The prevalence of all RS, except sputum production, was significantly higher among Abiraterone datasheet WP smokers, S-DI and S-NI, compared with the control group (P? total amount of smoking in any group of smokers (Table?6). There were significant inverse correlations between PFT values, except MEF25, and duration and total amount of WP smoking, and number of WP smoked per week (P?Vatalanib (PTK787) 2HCl between PFT values, except forced vital capacity, FEV1 and MEF25, and duration and total amount of smoking (P?