Open Access Methodology

Development of HomeSTEAD’s physical activity and screen time physical environment inventory

Derek Hales12, Amber E Vaughn2, Stephanie Mazzucca12, Maria J Bryant3, Rachel G Tabak4, Christina McWilliams2, June Stevens1 and Dianne S Ward12*

Author Affiliations

1 Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 245 Rosenau Hall, CB 7461, Chapel Hill, NC 27599-7461, USA

2 Center for Health Promotion and Disease Prevention, University of North Carolina at Chapel Hill, 1700 Martin L. King Jr. Blvd., CB 7426, Chapel Hill, NC 27599-7426, USA

3 Clinical Trials Unit (CTRU), University of Leeds, Leeds LS2 9JT, UK

4 Prevention Research Center in St. Louis, Brown School, Washington University in St. Louis, 621 North Skinker Blvd., St. Louis, MO 63130-4838, USA

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International Journal of Behavioral Nutrition and Physical Activity 2013, 10:132  doi:10.1186/1479-5868-10-132

Published: 5 December 2013

Abstract

Background

The home environment has a significant influence on children’s physical activity, sedentary behavior, dietary intake, and risk for obesity and chronic disease. Our understanding of the most influential factors and how they interact and impact child behavior is limited by current measurement tools, specifically the lack of a comprehensive instrument. HomeSTEAD (the Home Self-administered Tool for Environmental assessment of Activity and Diet) was designed to address this gap. This new tool contains four sections: home physical activity and media equipment inventory, family physical activity and screen time practices, home food inventory, and family food practices. This paper will describe HomeSTEAD’s development and present reliability and validity evidence for the first section.

Methods

The ANGELO framework guided instrument development, and systematic literature reviews helped identify existing items or scales for possible inclusion. Refinement of items was based on expert review and cognitive interviews. Parents of children ages 3–12 years (n = 125) completed the HomeSTEAD survey on three separate occasions over 12–18 days (Time 1, 2, and 3). The Time 1 survey also collected demographic information and parent report of child behaviors. Between Time 1 and 2, staff conducted an in-home observation and measured parent and child BMI. Kappa and intra-class correlations were used to examine reliability (test-retest) and validity (criterion and construct).

Results

Reliability and validity was strong for most items (97% having ICC > 0.60 and 72% having r > 0.50, respectively). Items with lower reliability generally had low variation between people. Lower validity estimates (r < 0.30) were more common for items that assessed usability and accessibility, with observers generally rating usability and accessibility lower than parents. Small to moderate, but meaningful, correlations between physical environment factors and BMI, outside time, and screen time were observed (e.g., amount of child portable play equipment in good condition and easy to access was significantly associated with child BMI: r = -0.23), providing evidence of construct validity.

Conclusions

The HomeSTEAD instrument represents a clear advancement in the measurement of factors in the home environment related to child weight and weight-related behaviors. HomeSTEAD, in its entirety, represents a useful tool for researchers from which they can draw particular scales of greatest interest and highest relevance to their research questions.

Keywords:
Home environment; Physical characteristics; Physical activity; Screen time; Measurement