The target number of completed surveys
was 300, which is powered to detect an effect size of
approximately 0.3 for difference in fat intake between label
users and nonusers, or a difference of 17 g fat based on our
calculation of a standard deviation of 52 g fat/day from the
National Health and Nutrition Examination Survey (NHANES)
2007-2008 for men and women aged 19 to 50 years.