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Comparing prevalence of tobacco use in STAGE (twins 20–47 years old) and Screening Across the Lifespan Twin study (SALT) (twins 42–64 years old). Top panel: males; bottom panel: females. Statistically significant p values of logistic regression analyses indicated that tobacco use differ across the two studies, when age and twin correlation are considered. All p<.0001 except for “Ever Smoker” among females, p=.009.
