Statistical analysis
REGRESSIONS
We measured the percentages of women coded with UAC who received any antibiotic during the 12-month post-intervention window (Dec 3, 2010 to Dec 3, 2011) in the Early and Delayed arm, as well as the FPs’ preferences for each type of antibiotic. We compared the preferences both by calculating differences with 95% confidence intervals (CI), and by estimating preference odds ratios (OR) via logistic regressions in which the ratio of change in the intervention group between the pre-intervention period to the post-intervention period was compared to the same ratio of change (or non-change) in the delayed control group [