1. Study Design Sample Study Period
2. Kang et al (2003) Cross-sectional postal survey with telephone interviews for 2X non-responders; a population-based stratified random sampling method was used. Oversampling of women reservists and Nat'l Guard members. 11 441 Gulf War Era veterans; 9 476 non-Gulf War veterans; populations identified by DoD as deployed or not deployed to the Gulf Nov. 1995-1996
3. Barrett et al (2002);
4. Reanalysis of Iowa Persian
5. Gulf Study Cross-sectional telephone survey; population based 3 695 persons completed a telephone interview; 13 telephone survey participants were excluded because of missing information; 3 682 Gulf War veterans and control subjects of the same era Sept. 1995-May 1996