Fig. 4
From: Best practices for analyzing large-scale health data from wearables and smartphone apps
Comparison of demographics of U.S. users of a smartphone and data from traditional surveillance studies. a Body Mass Index (BMI) distribution of users of the Argus app (blue) vs. the U.S. population as measured in the National Health and Nutrition Examination Survey66 (NHANES; red). b Age distribution of users of the Argus app vs. NHANES. The counts for the NHANES sample are weighted according to the NHANES-provided sample weights, thus the distributions approximate the general U.S. population and the total of the weighted counts in the histogram matches the number of individuals in the 2011–2012 NHANES study year. While there are differences between the distributions, the app dataset, due to its massive size, has large coverage of users between the ages of 15 and 70 and BMIs from 20 to 40. For example, the dataset includes 32,000 individuals in the U.S. over age 60 and 113,000 individuals in the U.S. whose BMI classifies them as obese
