What is one method of protecting identifiable information in a longitudinal study collecting sensitive data?

Securing a Certificate of Confidentiality is a robust method of protecting identifiable information in longitudinal studies that collect sensitive data. This certificate, issued by the National Institutes of Health (NIH) and other agencies, provides researchers with legal protection against disclosing identifiable information about study participants. It helps ensure that data shared with outside parties, such as in the event of a subpoena or similar legal action, remains confidential. This protection encourages participants to disclose sensitive information without the fear of it being revealed, thereby enhancing the quality and integrity of the data collected.

Using a secure online data storage system, while important for data integrity and accessibility, does not provide the same level of legal protection regarding the confidentiality of participants' identities. Similarly, conducting interviews in a private setting enhances confidentiality but does not address wider legal and regulatory issues surrounding data disclosure. Lastly, securing a waiver of liability from subjects pertains more to the risks involved in participation rather than the protection of identifiable information itself. Thus, obtaining a Certificate of Confidentiality is the most effective option among these choices for safeguarding sensitive data in research settings.