[ IIb ] Pisinger C, Aadahl M, Toft U, Birke H, Zytphen-Adeler J, Jrgensen T
Second, we estimated multivariable linear regression models of cigarettes smoked per day, conditional on the frequency of vaping (categorized as every-day, some-days, ever but no longer, never), psychological distress (categorized as NPD, MPD, and SPD), the interaction of vaping and psychological distress (these variables were demeaned, or centered so that main effect coefficients could be directly interpreted 26 ), and other covariates described above
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The growth in prevalence is underpinned by demographic trends
even at a time when the Civil Rights movement was under way