Prenatal Maternal Anxiety as a Risk Factor for Preterm Birth and the Effects of Heterogeneity on This Relationship: A Systematic Review and Meta-Analysis

Figure 2

The effect of excluding estimates of dubious quality on the heterogeneity of the estimates of the OR for anxiety and PTB. There were three exclusion criteria: () the results of the study were numerically suspicious; () the authors reported the odds ratio for a continuous predictor variable; and () the odds ratio was inappropriately adjusted as described in Critical Appraisal.