Resolution: standard / high
Figure 7.
DAG depicting a modification of Figure 1 where CW has a common cause (U) with BP. In the directed path BW→CW←U→BP, CW acts as a collider if left uncontrolled for in the analysis of the effect of BW on BP.
Arah Emerging Themes in Epidemiology 2008 5:5 doi:10.1186/1742-7622-5-5
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