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Statistical inference for an interaction variable is exactly the same as for ordinary regression predictors

Smokers children suffer reduced lung function, which continues to affect them in the form of chronic respiratory disorders in adulthood

Bulletin of the World Health Organization, 1964

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Measures of health improvements include cases avoided (CA), hospital days avoided (HDA), deaths averted (DA), and life-years saved (LYS).5 Other measures include cost per quitter (CPQ) enrolled in community-based cessation programs such as a self-help program, a smoking cessation class, an incentive-based cessation contest,44 or in a quitline program.45 The cost effectiveness of a cessation program may not only be looked at in absolute terms but also in relative or comparative terms to other intervention programs because each program may have different dimensions of cost effectiveness