The changes in weekly number of chest pain episodes and additional short-acting nitrates taken in case of need with time in studied groups KardasPrzemyslaw 2011 <p><b>Copyright information:</b></p><p>Taken from "Compliance, clinical outcome, and quality of life of patients with stable angina pectoris receiving once-daily betaxolol versus twice daily metoprolol: a randomized controlled trial"</p><p></p><p>Vascular Health and Risk Management 2007;3(2):235-242.</p><p>Published online Jan 2007</p><p>PMCID:PMC1994030.</p><p>© 2007 Dove Medical Press Limited. All rights reserved</p>Two initial weeks constitute baseline period.