Obstetrics and Gynecology International / 2012 / Article / Fig 1

Review Article

The Problem of Confounding in Studies of the Effect of Maternal Drug Use on Pregnancy Outcome

Figure 1

Diagrams showing relationships between exposure, outcome, and a third factor.
148616.fig.001a
(a)
148616.fig.001b
(b)
148616.fig.001c
(c)

Article of the Year Award: Outstanding research contributions of 2020, as selected by our Chief Editors. Read the winning articles.