Research on informed consent: investigator-developed versus focus group-developed consent documents, a VA cooperative study

In the Department of Veterans Affairs Cooperative Study (VACSP) #470, A Randomized, Multicenter, Controlled Trial of Multi-Modal Therapy in Veterans with Gulf War Illnesses, a substudy was designed with the primary objective of comparing the utility of an informed consent document developed by a focus group of Gulf War veterans (focus group-developed) to an informed consent document developed by the standard process involving the study investigators (investigator-developed). In December 1998 a focus group of five Gulf War veterans convened at the coordinating center and developed a consent document during three sessions. The focus group used the investigator-developed consent document as a "starting point" and then modified it by consensus agreement. They also reviewed and modified the substudy's assessment questionnaire. Utility will be evaluated in 1092 veterans participating in the parent study, VACSP #470, by directly comparing selected patient-centered outcomes between those receiving the focus group-developed consent document versus those receiving the investigator-developed document. The primary outcomes to be evaluated over a 1-year follow-up period include measures of the informed consent process, such as patient recall, expectations about risks and benefits of participation, and understanding about the voluntariness of consent. Secondary outcomes will assess the impact of the substudy on the parent study with respect to recruitment and adherence. VACSP #470 was initiated in May 1999 in 20 sites that were randomly allocated to use either the focus group-developed or investigator-developed consent document. Sites are unaware of the type of consent document assigned. This article focuses on the rationale and design of the informed consent substudy and also discusses potential ethical issues.