Figure 5 | Scientific Reports

Figure 5

From: Roles of drinking and diet in the U-shaped relationship between smoking and BMI in middle-aged and elderly Chinese rural adults

Figure 5

A schematic illustration of the model tested. The coefficient a represents the effect of X (Number of cigarettes smoked per day) on the Mediator (M; Alcohol units consumed per day), the coefficient b represents the effect of M on Y (Body Mass Index) controlling for X, the coefficient c’ represents the direct effect of X on Y while controlling for M and the coefficient c represents the total effect of X on Y. The indirect effect of X on Y was significant (ab = 0.0570; SE = 0.0076; 95% CI, 0.0423–0.0725). c = c’ + ab. Age, gender, education level, annual income and consumptions of total vegetables, fresh fruits and meats were controlled for by entering them into the models as covariates. *p < 0.0001.

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