Most people completing a questionnaire

According to Official Guinness Records,

The most people completing a questionnaire is 3,461 and was achieved by Sanofi Aventis de México S.A. de C.V. and La Asociación Psiquiátrica Mexicana (both Mexico) at the Aguascalientes International Speedway in Aguascalientes, Mexico, on 21 March 2010.
The questionnaire was titled the Atenas Sleep Scale and asked questions about insomnia. The questionnaire was distributed to the audience at a NASCAR car race.

For a complete list of 2010 records, please visit 2010 Guinness Records in Mexico.

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