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Figure 1

Figure 1. From: Methods for estimating confidence intervals in interrupted time series analyses of health interventions.

Time series of warfarin-interacting medication prescription rates by month (warfarin-interacting medication prescriptions per 10,000 warfarin users per month). A, Interacting medications (combined); B, warfarin-acetaminophen. Fitted trend lines show predicted values from the segmented regression analysis. Transition period is the intervention implementation period.

Fang Zhang, et al. J Clin Epidemiol. 2009 February;62(2):10.1016/j.jclinepi.2008.08.007.

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