By
Natalie on Aug 15, 2007
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"How often do you look for information online about health topics – often, sometimes, hardly ever or never?"
Base: Have access to Internet. Note: Percentages may not add up exactly to 100% due to rounding.
Methodology
The Harris Poll® was conducted by telephone within the United States between June 7 and 12, 2005 among a nationwide cross section of 1,015 adults (aged 18 and over). Figures for age, sex, race, education, number of adults, number of voice/telephone lines in the household, region and size of place were weighted where necessary to align them with their actual proportions in the population.
In theory, with a probability sample of this size, one can say with 95 percent certainty that the overall results have a sampling error of plus or minus 3 percentage points of what they would be if the entire U.S. adult population had been polled with complete accuracy. Sampling error for those who have Internet access (764) and those who have ever looked for health information online (623) is higher and varies. Unfortunately, there are several other possible sources of error in all polls or surveys that are probably more serious than theoretical calculations of sampling error. They include refusals to be interviewed (nonresponse), question wording and question order, interviewer bias, weighting by demographic control data and screening (e.g., for likely voters). It is impossible to quantify the errors that may result from these factors.
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