Research Question:

What are the General Anxiety Disorder (GAD) scores of people in Singapore who are positive for Covid-19 and who have completed the home recovery program (HRP)?

1. Explain the term ‘hierarchy of evidence’

An article by Evans (2003) stated that it is well known that research design can be unequal due to the risk of error and bias in the result. Canadian Task Force has published a hierarchy of evidence well known in a report on the Periodic Health Examination in late 1979(Burns et al., 2011; Evans, 2003).

The same article also stated that RCT was the highest level of evidence in the hierarchy as it is most effective (Evans, 2003). Different research methods provide different evidence for the answer of specific questions, hence systemic review replace RCT as the highest level of evidence with the increasing of its popularity(Evans, 2003).

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