Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted.
The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov.
Updates regarding government operating status and resumption of normal operations can be found at opm.gov.
Experimental designs require random assignment, a control or comparison group, and pre-and post-intervention assessments.
Quasi-experimental designs do not require random assignment, but do require a comparison or control group and pre- and post-intervention assessments. Studies that are based on single group, pre-/posttest designs do not meet this requirement.
