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1641. AHRQ Slide Template 2009 (ppt file)
      effectivehealthcare.ahrq.gov/sites/default/files/related_files/selecting-evidence.ppt
      January 01, 2010 - AHRQ Slide Template 2009 When To Select Observational Studies as Evidence for Comparative Effectiveness Reviews Prepared for: The Agency for Healthcare Research and Quality (AHRQ) Training Modules for Systematic Reviews Methods Guide www.ahrq.gov When To Select Observational Studies as Evidence for Comparative Eff…

1642. Ch 3-User-Guide-To-Ocer 130129 (pdf file)
      effectivehealthcare.ahrq.gov/sites/default/files/ch_3-user-guide-to-ocer_130129.pdf
      September 21, 2012 - 35 Abstract Patient populations within a research study are heterogeneous. That is, they embody characteristics that vary between individuals, such as age, sex, disease etiology and severity, presence of comorbidities, concomitant exposures, and genetic variants. These varying patient characteristics can potentiall…