concurrent nonrandomized control

What is concurrent nonrandomized control?

concurrent nonrandomized control is A control group that is observed by investigators at the same time as the treatment group but that was not established using random assignment of participants to control and treatment groups. Differences in the composition of the treatment and control groups may result.

 

source: A GLOSSARY OF TERMS FOR COMMUNITY HEALTH CARE AND SERVICES FOR OLDER PERSONS. World Health Organization, 2004.

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