Knowledge of Physical Activity Guidelines Among Adults in the United States, HealthStyles 2003−2005

BACKGROUND: We estimated percentages of US adults (>/=18 years) who knew that prior federal physical activity (PA) guidelines call for a minimum of 30 minutes of moderate-intensity PA most days (>/=5)/week using 2003 to 2005 HealthStyles, an annual mail survey. METHODS: 10,117 participants identified "the minimum amount of moderate-intensity PA the government recommends to get overall health benefits." Response options included 30/>/=5, 20/>/=3, 30/7, and 60/7 (minutes/days per week), "none of these," and "don't know." The odds of correctly identifying the guideline was modeled by participant sex, age, race/ethnicity, income, education, marital status, body mass index, physical activity level, and survey year using logistic regression. RESULTS: 25.6% of respondents correctly identified the guideline. Women were 30% more likely to identify the guideline than men (Odds Ratio [95% Confidence Limits] (OR) = 1.28 [1.15, 1.44]). Regular PA was positively associated with identifying the guideline versus inactivity (OR = 2.08 [1.73, 2.50]). Blacks and those earning <$15,000 annually were 24% to 32% less likely to identify the guideline than whites and those earning >$60,000, respectively. CONCLUSIONS: Most adults did not know the previous moderate-intensity PA recommendation, which indicates a need for effective communication strategies for the new 2008 Physical Activity Guidelines for Adults.