There are several reasons to conduct multi-site studies:
Generalizability: By including diverse populations, the findings are more likely to be applicable to a wider range of people. Sample Size: Larger sample sizes increase the statistical power of the study, making it easier to detect significant associations. Resource Sharing: Multiple sites can share resources, such as funding, expertise, and equipment, making the study more feasible and cost-effective. Replication: Conducting the study in different settings helps to confirm that the findings are not unique to a single location, enhancing the reliability of the results.