Fig. 2. Quarterly trend of OAC prescription among patients with atrial fibrillation from HIRA-NPS between 2013 and 2016. Solid line = results of segmented regression analysis of interrupted time series method, dotted line = expected number of patients who were prescribed OACs, estimated by the trend between the first quarter of 2013 and the second quarter of 2015.OACs = oral anticoagulants, HIRA-NPS = Health Insurance Review and Assessment Service-National Patient Samples. J Korean Med Sci. 2018 Jun;33(23):e163. https://doi.org/10.3346/jkms.2018.33.e163