Increase Font Size Decrease Font Size View as PDF Print

2010 DGAC Methodology: Class of Research

Classification of Reports1

 

 

Primary Reports

 

 

Secondary Reports

 

A

Randomized controlled trial (RCT)

 

 

 

M

Meta-analysis or Systematic review

Decision analysis

Cost-benefit analysis

Cost-effectiveness study

 

B

Cohort study

C

Nonrandomized trial with concurrent or historical controls

Case-control study

Study of sensitivity and specificity of a diagnostic test

Time series

 

R

Narrative review (Review article)

Consensus statement

Consensus report

D

Cross-sectional study

Trend Study

Case series

Case report

Before and after study

 

X

Medical opinion

 

 

Classifying studies and reports gives an initial picture of the type of studies and level of evidence available. It also helps organize the reports for critical appraisal.  Once the study design is identified and classified, this classification is then recorded on the article's worksheet template.


1Adapted by the American Dietetic Association from ©Joint Commission Resources: "A Practical Approach to Evidence Grading." Joint Commission Journal on Quality Improvement 2000:Volume 26(12):707