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GPS or travel diary: Comparing spatial and temporal characteristics of visits to fast food restaurants and supermarkets

To assess differences between GPS and self-reported measures of location, we examined visits to fast food restaurants and supermarkets using a spatiotemporal framework. Data came from 446 participants who responded to a survey, filled out travel diaries of places visited, and wore a GPS receiver for...

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Autores principales: Scully, Jason Y., Vernez Moudon, Anne, Hurvitz, Philip M., Aggarwal, Anju, Drewnowski, Adam
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5384745/
https://www.ncbi.nlm.nih.gov/pubmed/28388619
http://dx.doi.org/10.1371/journal.pone.0174859
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author Scully, Jason Y.
Vernez Moudon, Anne
Hurvitz, Philip M.
Aggarwal, Anju
Drewnowski, Adam
author_facet Scully, Jason Y.
Vernez Moudon, Anne
Hurvitz, Philip M.
Aggarwal, Anju
Drewnowski, Adam
author_sort Scully, Jason Y.
collection PubMed
description To assess differences between GPS and self-reported measures of location, we examined visits to fast food restaurants and supermarkets using a spatiotemporal framework. Data came from 446 participants who responded to a survey, filled out travel diaries of places visited, and wore a GPS receiver for seven consecutive days. Provided by Public Health Seattle King County, addresses from food permit data were matched to King County tax assessor parcels in a GIS. A three-step process was used to verify travel-diary reported visits using GPS records: (1) GPS records were temporally matched if their timestamps were within the time window created by the arrival and departure times reported in the travel diary; (2) the temporally matched GPS records were then spatially matched if they were located in a food establishment parcel of the same type reported in the diary; (3) the travel diary visit was then GPS-sensed if the name of food establishment in the parcel matched the one reported in the travel diary. To account for errors in reporting arrival and departure times, GPS records were temporally matched to three time windows: the exact time, +/- 10 minutes, and +/- 30 minutes. One third of the participants reported 273 visits to fast food restaurants; 88% reported 1,102 visits to supermarkets. Of these, 77.3 percent of the fast food and 78.6 percent supermarket visits were GPS-sensed using the +/-10-minute time window. At this time window, the mean travel-diary reported fast food visit duration was 14.5 minutes (SD 20.2), 1.7 minutes longer than the GPS-sensed visit. For supermarkets, the reported visit duration was 23.7 minutes (SD 18.9), 3.4 minutes longer than the GPS-sensed visit. Travel diaries provide reasonably accurate information on the locations and brand names of fast food restaurants and supermarkets participants report visiting.
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spelling pubmed-53847452017-05-03 GPS or travel diary: Comparing spatial and temporal characteristics of visits to fast food restaurants and supermarkets Scully, Jason Y. Vernez Moudon, Anne Hurvitz, Philip M. Aggarwal, Anju Drewnowski, Adam PLoS One Research Article To assess differences between GPS and self-reported measures of location, we examined visits to fast food restaurants and supermarkets using a spatiotemporal framework. Data came from 446 participants who responded to a survey, filled out travel diaries of places visited, and wore a GPS receiver for seven consecutive days. Provided by Public Health Seattle King County, addresses from food permit data were matched to King County tax assessor parcels in a GIS. A three-step process was used to verify travel-diary reported visits using GPS records: (1) GPS records were temporally matched if their timestamps were within the time window created by the arrival and departure times reported in the travel diary; (2) the temporally matched GPS records were then spatially matched if they were located in a food establishment parcel of the same type reported in the diary; (3) the travel diary visit was then GPS-sensed if the name of food establishment in the parcel matched the one reported in the travel diary. To account for errors in reporting arrival and departure times, GPS records were temporally matched to three time windows: the exact time, +/- 10 minutes, and +/- 30 minutes. One third of the participants reported 273 visits to fast food restaurants; 88% reported 1,102 visits to supermarkets. Of these, 77.3 percent of the fast food and 78.6 percent supermarket visits were GPS-sensed using the +/-10-minute time window. At this time window, the mean travel-diary reported fast food visit duration was 14.5 minutes (SD 20.2), 1.7 minutes longer than the GPS-sensed visit. For supermarkets, the reported visit duration was 23.7 minutes (SD 18.9), 3.4 minutes longer than the GPS-sensed visit. Travel diaries provide reasonably accurate information on the locations and brand names of fast food restaurants and supermarkets participants report visiting. Public Library of Science 2017-04-07 /pmc/articles/PMC5384745/ /pubmed/28388619 http://dx.doi.org/10.1371/journal.pone.0174859 Text en © 2017 Scully et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Scully, Jason Y.
Vernez Moudon, Anne
Hurvitz, Philip M.
Aggarwal, Anju
Drewnowski, Adam
GPS or travel diary: Comparing spatial and temporal characteristics of visits to fast food restaurants and supermarkets
title GPS or travel diary: Comparing spatial and temporal characteristics of visits to fast food restaurants and supermarkets
title_full GPS or travel diary: Comparing spatial and temporal characteristics of visits to fast food restaurants and supermarkets
title_fullStr GPS or travel diary: Comparing spatial and temporal characteristics of visits to fast food restaurants and supermarkets
title_full_unstemmed GPS or travel diary: Comparing spatial and temporal characteristics of visits to fast food restaurants and supermarkets
title_short GPS or travel diary: Comparing spatial and temporal characteristics of visits to fast food restaurants and supermarkets
title_sort gps or travel diary: comparing spatial and temporal characteristics of visits to fast food restaurants and supermarkets
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5384745/
https://www.ncbi.nlm.nih.gov/pubmed/28388619
http://dx.doi.org/10.1371/journal.pone.0174859
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