ArticleHealth & place2018
How many days of global positioning system (GPS) monitoring do you need to measure activity space environments in health research?
Article in Health & place, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 47 papers, 2 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
47 citing papers in PubMed, 2 syntheses or guidelines pooled it.
- Pooled it
- Methodologies for assessing contextual exposure to the built environment in physical activity studies: A systematic review.Health & place · 2019Pooled it
- Demographic Associations with GPS-Inferred Routine Activity Spaces: Data from the Everyday Environments and Experiences (E3) Study.Sensors (Basel, Switzerland) · 2026Article
- Elderly Activity Life-Space Envelopes (EASE): Development and Feasibility of a Comprehensive, Integrated Protocol for Life-Space Mobility Research in Population Health.JMIR research protocols · 2025Article
- Measuring Psychological Well-Being and Behaviors Using Smartphone-Based Digital Phenotyping: An Intensive Longitudinal Observational mHealth Pilot Study Embedded in a Prospective Cohort of Women.JMIR mHealth and uHealth · 2025Observational
- Article
- Is home where the heat is? comparing residence-based with mobility-based measures of heat exposure in San Diego, California.Journal of exposure science & environmental epidemiology · 2025Article
- Changes in activity spaces, life spaces, and exposures to physical activity-promoting environments among women with overweight or obesity.Health & place · 2025Article
- Activity Space Mapping and Pre-Exposure Prophylaxis Uptake Among Gay, Bisexual, and Other Sexual Minority Men in Small Cities and Towns in the United States.AIDS and behavior · 2025Article
- Place effects on adult obesity and cardiometabolic health: Evidence from a natural experiment.Health & place · 2025Article
- Article
- Measuring Environmental and Behavioral Drivers of Chronic Diseases Using Smartphone-Based Digital Phenotyping: Intensive Longitudinal Observational mHealth Substudy Embedded in 2 Prospective Cohorts of Adults.JMIR public health and surveillance · 2024Observational
- Examination of multidimensional geographic mobility and sexual behaviour among Black cisgender sexually minoritized men in Chicago.Geospatial health · 2024Article
- GPS-derived environmental exposures during pregnancy and early postpartum - Evidence from the madres cohort.The Science of the total environment · 2024Article
- Article
- Article
- Using Smartphone Survey and GPS Data to Inform Smoking Cessation Intervention Delivery: Case Study.JMIR mHealth and uHealth · 2023Article
- Walking Behaviour of Individuals with Intermittent Claudication Compared to Matched Controls in Different Locations: An Exploratory Study.International journal of environmental research and public health · 2023Article
- Using GPS Technologies to Examine Community Mobility in Older Adults.The journals of gerontology. Series A, Biological sciences and medical sciences · 2023Article
- Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors.
Funding
Abstract
This study examined the number of days of global positioning system (GPS) monitoring needed to measure attributes of an individual's routine activity space. Multiple alternative activity space representations (cumulative, mean daily), measures (kernel density, route buffer, convex hull), and attributes (area size, supermarkets, fast food restaurants, parks) were examined. Results suggested wide variability in required GPS days to obtain valid estimates of activity space attributes (1-23 days). In general, fewer days were needed for mean daily activity space representations, kernel density measures, and densities of environmental exposures (vs. counts). While kernel density measures reliably estimated between-person differences in attributes after just a few days, most variability in environmental attributes for convex hull and route buffer measures was within-person. Based on these results, a minimum of 14 days of valid GPS data is recommended to measure activity spaces.
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What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.