Internet-Based and Self-Reports in Assessing Diet and Physical Activity Within AARP
Condition: Healthy Subject
Study type: Observational

Summary: 
      This research trial studies how well internet-based and self-report instruments measure food
      intake and physical activity levels and their relationship with disease within American
      Association of Retired Persons (AARP) members. Comparing new internet-based questionnaires
      developed by the National Cancer Institute that report all the foods consumed and activities
      performed in an entire day to standardized physical measurements may help to determine if the
      information collected is accurate.
    

Detailed description: 
      PRIMARY OBJECTIVES:

      I. Evaluate the measurement error structure of self-reported dietary assessment instruments,
      including, a food frequency questionnaire (National Cancer Institute [NCI]'s Diet History
      Questionnaire-II [DHQ-II]), and 24-hour recalls using the new automated self-administered
      24-hour dietary recall (ASA24) instrument with respect to absolute energy intake, absolute
      protein intake, and protein density-and potentially other nutritional factors such as
      potassium intake.

      II. Investigate the measurement error structure associated with self-reported active and
      sedentary behaviors, including multiple administrations of a new 24-hour recall (activity
      completed over time in 24-hours [ACT24]) and selected questionnaires using energy expenditure
      from doubly labeled water (DLW) and physical activities measures of physical activity
      monitors as reference instruments.

      III. Evaluate alternative analytic approaches for combining different types of self-report
      data on diet and physical activity-related behaviors as well as self-report plus objective
      data (derived from activity monitors, heart rate monitors e.g.).

      IV. Within the context of an AARP-based cohort, explore the adjustment of observed RRs for
      several key cancer hypotheses related to diet and physical activity based on the measurement
      error data provided by the new study.

      V. Evaluate the potential for 'energy adjustment' that incorporates physical activity and
      body size.

      OUTLINE:

      Patients complete the ASA24 about foods, cooking methods, and other aspects of diet every 2
      months for up to 6 times, and complete ACT24 about activities and time reporting every 2
      months for up to 6 times. Patients also complete DHQ-II questionnaires at the beginning and
      end of the study about the frequency and portion sizes of foods consumed over the past 12
      months, provide a 7-day food checklist twice with the DHQ-II, and provide a 4-day food record
      twice, once every 6 months. Physical activity monitors are worn to measure movement at
      different intensity levels and sitting or standing periods, twice during the study with 6
      months between each time they are worn.
    

Intervention name(s): Internet-Based Intervention; Internet-Based Intervention; Monitoring Device; Questionnaire Administration
Intervention type(s): Other; Other; Device; Other
Intervention description(s): Complete ASA24; Complete ACT24 reporting; Wear accelerometer and inclinometer physical activity monitors; Ancillary studies
Other intervention name(s): Monitor
Observational model: Cohort
Time perspective: Prospective
Sampling method: Non-Probability Sample
Study population: 
        Members within the existing NIH-AARP Diet and Health Study members (aged 50-71 in 1995-96)
        and younger AARP members born after 1945 ('baby boomers') and living in the Pittsburgh area
        in Pennsylvania
      
Biospecimen description: 
      saliva, urine, blood