Figure 1.

Selection of participants for the MVP 1990–1991 Gulf War Era Survey and response rates. Legend: ¹ Veterans enrolled in the MVP who gave a blood specimen as of 10 July 2018. ² MVP enrollees with blood specimen who served during 1 August 1990–31 July 1991 (according to VADIR) and who were matched to MVP data using social security number and date of birth. MVP GW Veterans represented 18.7% of all eligible MVP participants enrolled at the time of cohort selection (i.e., 110,001 out of 589,620). ³ Mailing vendor had a valid address on file and mailing was not returned due to bad address (n = 25 Veterans were excluded due to not having a valid mailing address).