Fig. 1From: Association of hypertension and depression with mortality: an exploratory study with interaction and mediation modelsSchematic diagram of mediation analysis by Sobel Test. β represents the total effect of hypertension or depression on all-cause or cardiovascular mortality. β1 represents the effect of hypertension on depression or the effect of depression on hypertension. β2 represents the effect of depression on mortality when hypertension is not considered, or the effect of hypertension on mortality when depression is not considered. β3 represents the direct effect of hypertension or depression on mortalityBack to article page