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. Author manuscript; available in PMC: 2010 Apr 11.
Published in final edited form as: J Natl Cancer Inst. 2009 Feb 24;101(5):321–330. doi: 10.1093/jnci/djn513

Figure 1. Relative indices of inequality (RII) for education and their corresponding 95% confidence intervals (95% CIs) by smoking status and sex in the European Prospective Investigation into Cancer and Nutrition cohort (N=391,251).

Figure 1

(●◆■▲, no adjustment; ○□▵, adjusted for smoking) The confidence interval of the estimate among men never smokers is (0.39 to 8.99). All analyses are stratified for age at baseline and center. Among current smokers, the model includes age at starting (continuous), duration of smoking (continuous in years), current quantity (continuous), a quadratic term for current quantity, two interaction terms (quantity × duration and age at starting × duration). Among ex-smokers, the model includes age at starting (continuous), duration of smoking (continuous in years), and one interaction term (age at starting × duration).