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This analysis was conducted using the following model: Cortical thickness= b 0 Intercept+ b 1 Gender+ b 2 Exact_Age_At_Scanning+ b 3 Number_Of_Years_Since_Last_Cigarette+ b 4 Pack-Years+error Results Demographics The mean age (means.d.) at MRI was 72.70.74 years for those that never smoked, 72.70.76 for ex-smokers and 72.70.63 for current smokers

Keep the conditions analogous: same time of day, comparable weather, same rhythm of puffs (use a 30-40-second timer between hits if you desire consistency)

The dependent variable was the students average grades from the last two semesters

Market share of the regular size filter category, or cigarettes of 74-84 mm length, declined to 77% last fiscal from 82%, mainly due to the introduction of smaller cigarettes and premiumisation of the category