Fig. 1From: Explaining better hearing in Norway: a comparison of two cohorts 20 years apart - the HUNT studyDirect acyclic graph (DAG) showing the assumed causal relationships between cohort (X) and hearing loss (Y) including a set of mediators (M) and intermediate mediator/confounder (L). The exogenous variables age and sex are omitted from the diagram but must be adjusted for in the analysesBack to article page