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Explication of interaction between TNFm and stress in the prediction of change in smoking using a negative binomial regression model, controlling for sex, SES-risk (ages 11–13), cell-type, and early cigarette consumption (ages 11–14). The lines represent the regression lines for different levels of TNFm (low: 1 SD below the mean; high: 1 SD above the mean). Simple slopes and confidence intervals provided in parentheses.
