Aging
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Figure 1
Figure 1.General third variable model of smoking, BMI and LTL. β, c and c’ are standardized regression coefficients; c=total effect; c’=direct effect; β1=indirect effect 1; β2=indirect effect 2; βInd=total indirect effect; BMI=body mass index; LTL=leukocyte telomere length. * P<0.05; ** P<0.01.