observational study

(Related concept: non-experimental study.) A study in which the investigators do not intervene, but only observe subjects who are (and sometimes who are not, for comparison purposes) exposed to a given factor, and interpret the outcomes. Note: This type of study is more subject to bias than is an experimental study such as a randomised controlled trial.

and • provides information on costs and financial impact. Note 2: The report may optionally discuss organisational considerations. Note 3: A “mini-HTA” may be as rigorous as an HTA report but typically has a restricted scope and so is quicker to produce. Note 4: Related terms include health technology, HTA report, rapid review, level of evidence