ID
41007
Description
Thomas L. McKenzie, Ph.D. .(2012). Behaviors of Eating and Activity for Children's Health: Evaluation System (BEACHES). Measurement Instrument Database for the Social Science. Retrieved 06.05.2020 from www.midss.ie Purpose To obtain objective data on children’s at home physical activity and sedentary behaviors and selected environmental (social and physical) variables that may influence these events. Description BEACHES is a direct observation system used to simultaneously record children’s physical activity and sedentary behaviors as well as related environmental characteristics and events. The physical activity codes have been validated using heart rate monitors and accelerometers, and the system can be used in homes, schools, and most settings where children might be found. The original system was developed within the framework of behavioral analysis and included coding for 10 separate dimensions. These dimensions have been modified to relate to the specific aims and study questions of AVENTURAS. The modified version is presented here. Timing BEACHES observations will be conducted on selected cohort children (20%) during one home visit 3 times each measurement year (i.e., 3 total years). Observations will be made at the child’s home on school days between the time the child returns home until the evening meal. Observations will be for 60 minutes, and consist of two-30 minute segments Observation Procedure A trained assessor, paced by voice prompts on an IPOD or MP3, will conduct the observations. Data will be recorded manually on prepared forms or on a PDA. Observation Procedures Home includes both inside and outside the home or apartment complex. Visit homes only on days a parent/guardian confirms the target child will be there for at least 2 hours. BEACHES observations will not be made when the child is away from home (e.g., at a friend’s house or in a park area that is not part of the apartment complex). Observers focus on the target child for a 15-second observation interval and then have 15 seconds to enter data codes onto prepared forms. Voice prompts on an IPOD or MP3 pace the alternating observation and recording periods. Each observe-record cycle requires 30 seconds; thus, a 90-minute period would produce 180 observation intervals. Three dimensions (Child Activity, Location, and People There) are scored using momentary time-sampling methods (i.e., codes are entered to describe events related to these three categories as they occur at the end of the “observe” interval). The other four dimensions (Activity Motivation, Activity Interactor, Views Media, and Eats) are scored using partial-interval time sampling (i.e., events are coded if they occur at any time during the 15-second “observe” interval). Observer Training and Calibration Assessors memorize operational definitions of the behavior dimensions and their subcategories first and then learn the general procedures for recording data. During assessor training videotaped examples and role-playing are used to demonstrate each category. This is followed by live observations at homes. Training for each observer continues until she exceeds an inter-observer agreement score of 80% on two different criterion videotapes, and 80% on two consecutive live observations (using interval-by-interval correspondence, with agreements divided by agreements plus agreements multiplied by 100). Observers are also trained how to interact in order to reduce reactivity. The average training program takes about 16 hours. Throughout the data collection period additional review and training sessions approximately one hour in length will be conducted at least every semester. To ensure maintenance of data quality and to guard against observer drift, observers should be reassessed once every three months through the independent coding of a videotape that has previously been coded by the designers of BEACHES. Any observer scoring below criteria level (80% agreement) should be retrained until mastery is once again achieved. Each observer should complete at least five reliability assessments in the field during each data collection period.
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- 5/6/20 5/6/20 -
- 6/10/20 6/10/20 -
Copyright Holder
Thomas L. McKenzie, Ph.D.
Uploaded on
June 10, 2020
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License
Creative Commons BY-NC 4.0
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Measurement Instrument Database for the Social Science (MIDSS)
Behaviors of Eating and Activity for Children's Health: Evaluation System (BEACHES)
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