Int J Health Geogr - Comparing self-identified and census-defined neighborhoods among adolescents using GPS and accelerometer.


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CKGROUND: Numerous definitions of neighborhood exist, yet few studies have considered youth's perceptions of neighborhood boundaries. This study compared youth-identified neighborhood (YIN) boundaries to census-defined neighborhood (CDN) boundaries, and determined how the amount of time spent and moderate-to-vigorous physical activity (MVPA) levels compared within both boundary types.METHODS: Adolescents aged 11-14 years were asked to identify their neighborhood boundaries using a map. Objective location and physical activity data collected using Global Positioning System (GPS) devices and accelerometers were used to calculate the amount of time spent and MVPA within youth-identified and census-defined neighborhood boundaries. Paired bivariate analyses compared mean area (meters squared), percent of total time, daily MVPA (minutes), time density (minutes/m2) and MVPA density (minutes/m2) for both boundary types.RESULTS: Youth-identified neighborhoods (1,821,705 m?) and census-defined neighborhoods (1,277,181 m?) were not significantly different in area, p = 0.30. However, subjects spent more time in youth-identified neighborhoods (80.3%) than census-defined neighborhoods (58.4%), p < 0.0001, and engaged in more daily MVPA within youth-identified neighborhoods (14.7 minutes) than census-defined neighborhoods (9.5 minutes), p<0.0001. After adjusting for boundary area, MVPA density (minutes of MVPA per squared meter of area) remained significantly greater for youth-identified neighborhoods (2.4 ? 10-4 minutes/m?) than census-defined neighborhoods (1.4 ? 10-4 minutes/m?), p=0.02.CONCLUSIONS: Adolescents perceive their neighborhoods to be similar in size to census-defined neighborhoods. However, youth-identified neighborhoods better capture the locations in which adolescents spend time and engage in physical activity. Asking adolescents to identify their neighborhood boundaries is a feasible and valuable method for identifying the spaces that adolescents are exposed to and use to be physically active.

Resumo Limpo

ckground numer definit neighborhood exist yet studi consid youth percept neighborhood boundari studi compar youthidentifi neighborhood yin boundari censusdefin neighborhood cdn boundari determin amount time spent moderatetovigor physic activ mvpa level compar within boundari typesmethod adolesc age year ask identifi neighborhood boundari use map object locat physic activ data collect use global posit system gps devic acceleromet use calcul amount time spent mvpa within youthidentifi censusdefin neighborhood boundari pair bivari analys compar mean area meter squar percent total time daili mvpa minut time densiti minutesm mvpa densiti minutesm boundari typesresult youthidentifi neighborhood m censusdefin neighborhood m signific differ area p howev subject spent time youthidentifi neighborhood censusdefin neighborhood p engag daili mvpa within youthidentifi neighborhood minut censusdefin neighborhood minut p adjust boundari area mvpa densiti minut mvpa per squar meter area remain signific greater youthidentifi neighborhood minutesm censusdefin neighborhood minutesm pconclus adolesc perceiv neighborhood similar size censusdefin neighborhood howev youthidentifi neighborhood better captur locat adolesc spend time engag physic activ ask adolesc identifi neighborhood boundari feasibl valuabl method identifi space adolesc expos use physic activ

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