The Stress in America™ survey was conducted online within the United States by Harris Interactive on behalf of the American Psychological Association between Aug. 3 and 31, 2012, among 2,020 adults ages 18+ who reside in the U.S.

The four generations noted in this report are defined as the following: Millennials n=340 (18- to 33-year-olds), Generation X n=397 (34- to 47-year-olds), Boomers n=1040 (48- to 66-year-olds) and Matures n=243 (67 years and older). For the purposes of this report, Generation X will be referred to as “Gen Xers” in brief.

Among the 2,020 adults surveyed, 1,424 report having been diagnosed with one or more of the following: Type 1 diabetes, Type 2 diabetes, cancer, heart disease or heart attack, high cholesterol, high blood pressure, overweight, stroke, asthma or other respiratory disease, chronic pain, depression, an anxiety disorder, arthritis or obesity. For the purposes of this report, this group will be referred to as “people with a chronic illness” or “chronic illness” in brief.

For the purposes of this report, the phrase “describes” represents respondents who selected “describes completely.” In addition, health care providers are referenced throughout the report as “providers” and “HCPs.”

Results were weighted to reflect the composition of the U.S. population ages 18+ as needed for age, sex, race/ethnicity, education, region and household income. For each of the city reports, results were weighted as needed for age, sex, race/ethnicity, education, region and household income among the entire population within the specific Metropolitan Statistical Area for each city as designated by the U.S. Office of Management and Budget. In addition to the national sample, oversamples in eight cities were collected resulting in a total of 1,715 interviews. Propensity score weighting was also used to adjust for respondents’ propensity to be online.

All sample surveys and polls, whether or not they use probability sampling, are subject to multiple sources of error, which are most often not possible to quantify or estimate, including sampling error, coverage error, error associated with nonresponse, error associated with question wording and response options, and post-survey weighting and adjustments. Therefore, Harris Interactive avoids the words “margin of error” as they are misleading. All that can be calculated are different possible sampling errors with different probabilities for pure, unweighted, random samples with 100 percent response rates. These are only theoretical because no published polls come close to this ideal.

Respondents for this survey were selected from among those who have agreed to participate in Harris Interactive surveys. Because the sample is based on those who were invited and agreed to participate in the Harris Interactive online research panel, no estimates of theoretical sampling error can be calculated.