The study was conducted for the Harvard School of Public Health via telephone by SSRS/ICR, an independent research company. Interviews were conducted from April 21 to May 13, 2010 among a nationally representative sample of 1491 respondents age 18 and older, who work at least 35 hours a week at a single primary workplace and are not self-employed. It excludes those working at companies with less than 20 employees and those working in the fields of education, health, emergency care or first responder services, and government. The margin of error for total respondents is +/-3.30% at the 95% confidence level
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