The survey of Hurricane Katrina evacuees was conducted Sept. 10-12 among 680 randomly selected evacuees age 18 or older residing in Houston shelters. Interviews were conducted face to face. The margin of error for overall results is plus or minus four percentage points. Fieldwork was conducted by International Communications Research of Media, Pa.

A total of 439 interviews were conducted in the Houston Reliant Park Complex (which included the Reliant Astrodome and the Reliant Center), 152 in the George R. Brown Convention Center, and 12 whose location was not recorded. The sample also included 77 respondents from five of the 14 smaller Red Cross shelters in the greater Houston area. Interviews were distributed among shelters in proportion to best estimates of the shelter populations on the dates of interviewing.

Interviews were conducted by 28 professional, Houston-based interviewers under the supervision of staff from the Kaiser Family Foundation and ICR, and with input from Post staff in Houston. The American Red Cross gave The Post-Kaiser-Harvard team permission to interview at the various centers, but was not a co-sponsor of the survey and bears no responsibility for the results.

About the Sponsors

This survey project was conducted by The Washington Post, the Henry J. Kaiser Family Foundation and the Harvard School of Public Health as part of an ongoing collaboration.

The three sponsors worked together to develop the survey questionnaire and analyze the results but are publishing independent summaries of the findings. Each organization bears sole responsibility for the work that appears under its name.

The Post and the Kaiser Family Foundation -- a nonprofit organization that conducts research on health care and other public policy issues -- paid for the surveys and related expenses.

The project team members from KFF included Drew E. Altman, president; Mollyann Brodie, vice president for public opinion research; and Erin Weltzien, research associate.

Harvard project team members included Robert J. Blendon, a professor at Harvard's School of Public Health and John F. Kennedy School of Government, and John M. Benson, managing director of the Harvard Opinion Research Program.

A more detailed version of the survey methodology is available on www.washingtonpost.com.