The feasibility of using mobile health applications to conduct observational clinical studies requires rigorous validation. Here, we report initial findings from the Asthma Mobile Health Study, a research study, including recruitment, consent, and enrollment, conducted entirely remotely by smartphone. We achieved secure bidirectional data flow between investigators and 7,593 participants from across the United States, including many with severe asthma. Our platform enabled prospective collection of longitudinal, multidimensional data (e.g., surveys, devices, geolocation, and air quality) in a subset of users over the 6-month study period. Consistent trending and correlation of interrelated variables support the quality of data obtained via this method. We detected increased reporting of asthma symptoms in regions affected by heat, pollen, and wildfires. Potential challenges with this technology include selection bias, low retention rates, reporting bias, and data security. These issues require attention to realize the full potential of mobile platforms in research and patient care.
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The study is funded by the Icahn School of Medicine at Mount Sinai, UL1TR001433-01, and with technology support from LifeMap Solutions.
E.E.S. (a co-investigator in this study, Chair of the Department of Genetics and Genomics Sciences, and Director of the Icahn Institute for Genomics and Multiscale Biology) and J.T.D. (a co-Investigator in this study and the Director of Biomedical Informatics at the Icahn School of Medicine at Mount Sinai (ISMMS) both hold equity in the form of stock options in LifeMap Solutions, a privately held company. In addition E.E.S. serves as an uncompensated advisory board member and is administratively responsible for the medical school's collaboration with LifeMap Solutions.
Integrated supplementary information
a) Based on location data from 4,612 Baseline users from 49 states, the log10 transformed percent distribution of asthma prevalence for asthma health app users is compared to 2013 national asthma prevalence statistics. SOURCE: 2013 Behavioral Risk Factor Surveillance System (BRFSS) http://www.cdc.gov/asthma/brfss/2013/tableC1.htm, Downloaded on 1/19/16. (b) The heatmap illustrates 37 features derived from the median of the maximum daily temperature over 5-day intervals for 3,646 user-linked zip codes (see Online Methods for details of the clustering method). (c) Northern (blue) and southern (red) regions of Contiguous US as determined by clustering of maximum median temperature (see methods). Figure shows the overlay of the county map on top of the state map, where color coding (North, blue and South, red) is based, in each case, on majority rule of user location clustering assignment.
Supplementary Figure 2 Retention analysis: correlations among covariates and the distribution of response rates.
Both (a) and (b) are based on n=537 Robust users who enrolled between March 9 2015 and June 8 2015. (a) Heatmap of the Pearson’s correlation matrix of the predictors for retention time in the Cox Proportional Hazards model. Lower diagonal cells in (a) represent the Pearson’s correlation coefficients; the upper diagonal cells indicate the p-values for testing zero correlation. (b) Histogram of individual response rates of daily surveys.
Heatmaps of self-reported day symptoms, night symptoms, and quick relief inhaler usage were plotted for participants (y-axis) stratified by baseline GINA classification across 180 days of study enrollment (x-axis). Only participants enrolled for at least 180 days by 9/9/2015 were plotted. Participants were sorted according to the number of non-missing responses for each plot. Responses to these questions were: True (red), False (yellow), or missing (black).
Pair-wise comparisons of correlation based on self-reported peakflow, day symptoms, night symptoms, and number of quick relief puffs. Each plot shows a histogram of correlation coefficients evaluated for each user based on his or her daily survey response time series. Total number of Robust users, average number of surveys per Robust user, and summary statistics for each comparison are shown in the lower diagonal.
Supplementary Figure 5 Distributions of self-reported asthma triggers at the start of enrollment and throughout the study period.
Based on data from 545 Robust users, barplots (left) show trigger distributions ordered by percentage rank of each asthma trigger for northern (top) and southern regions (bottom). Trigger distribution curves (right) are based on daily asthma trigger reports for robust users ordered by percentage rank at the start of enrollment for northern (top) and southern (bottom) regions respectively (see online Methods).
(a) Potential Asthma Health app audience by iPhone, Android and other smart devices. (b) Targeted demographics for the Asthma Health app.
Supplementary Figure 7 A simplified layout of the initialization, the data flow and security measures in the Asthma Mobile Health Application study.
(a) The initialization process in the Asthma Mobile Health Application study. (b) The data flow and security measures in the Asthma Mobile Health Application study.
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Chan, YF., Wang, P., Rogers, L. et al. The Asthma Mobile Health Study, a large-scale clinical observational study using ResearchKit. Nat Biotechnol 35, 354–362 (2017). https://doi.org/10.1038/nbt.3826