Fig. 4

Proportion of pregnancies with antibiotic prescription fills by peri-pregnancy period and proxies of pregnancy intention. Panel a: Any antibiotics, panel b: tetracyclines. T: Trimester. Error bars represent the 95% confidence intervals. For tetracyclines, results are not shown for T2 and T3 for reasons of confidentiality, as less than five pregnancies were exposed in some of the groups. Unstratified on folic acid for clarity of interpretation. A stratified table is shown in Additional file 3