There are different ways of defining and measuring that which constitutes being overweight and obese. Harris Interactive® has been using one method based on weight, height and body frame (small, medium or large) since 1983. In 2005 and for this new survey, Harris Interactive also calculated body mass index (BMI) using just height and weight. Regardless of the method used, the new survey shows a sharp increase this year in the percentage of U.S. adults who are overweight and obese.

Using the old definition (weight, height and body frame), the proportion of adults 25 years of age and over who are overweight increased to 83 percent this year, up from its highest previous measure of 80 percent in 2002 and 2003. Using this same measure, and counting those who are 20 percent or more overweight, fully 39 percent of U.S. adults are now obese.

Using the BMI, the new survey finds the percentage of overweight adults has increased from 59 to 66 percent this year, and those who are obese increased from 23 to 27 percent.

These are some of the results of a new Harris Poll of 1,016 U.S. adults surveyed by telephone by Harris Interactive between February 7 and 14, 2006.

Due to the fact that all surveys are subject to several possible sources of error, including measurement error and sampling error, it is useful to look at long-term trends, where several surveys are added together to form larger samples and iron out other possible fluctuations. Using this approach, the data show that overweight adults 25 years of age and over increased from 59 percent in the early 1980s to 79 percent, so far, in the years since 2000. This same method, averaging data over several years, shows that adults 25 years of age and over who are obese have increased from 15 percent in the early 1980s to 33 percent in the years since 2001. In other words, obesity has more than doubled over the course of more than 20 years.

Obesity as a cause of disease

Obesity has been linked to many different medical conditions. The surgeon general has indicated that obesity is a cause of heart disease, diabetes, elevated cholesterol, stroke, high blood pressure, some types of cancer, asthma, arthritis and depression. This new survey finds that many adults are aware that obesity is a cause of heart disease (55%) and diabetes (44%), but fewer adults say they know that it is also a cause of elevated cholesterol (14%), stroke (11%), high blood pressure (7%), some cancers (6%), asthma (3%), arthritis (3%) and depression (1%).

Seatbelt use and smoking

In addition to measuring weight and obesity, this survey has, since 1983, measured the percentage of U.S. adults who smoke cigarettes, and who wear seatbelts when in the front seats of cars.

Here the news is much better. The percentage of adults who claim that they always wear seatbelts in the front seats of cars have increased steadily from only 19 percent in 1983 to a current 86 percent.

The proportions of adults who smoke cigarettes has fallen, but this improvement is much more modest. In the early 1980s, 30 percent of adults smoked cigarettes. This has now fallen to 22 percent. However, about one in five U.S. adults still smoke, even though in many cities and states they cannot do so legally at work, in restaurants or in public spaces.

It is important to note that some adults use other kinds of tobacco products. In total, two percent of adults smoke pipes, four percent smoke cigars and two percent use chewing tobacco. Including these adults (some of whom smoke cigarettes), a total of 26 percent of all U.S. adults use some kind of tobacco product.

Methodology

The Harris Poll® was conducted by telephone within the United States between February 7 and 14, 2006, among a nationwide cross section of 1,016 adults aged 18 and over, of whom 910 are aged 25 and over. Figures for age, sex, race, education, number of adults and number of voice/telephone lines in the household 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 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. 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 (non-response), 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.

These statements conform to the principles of disclosure of the National Council on Public Polls.

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© 2006 HealthNewsDigest.com