Table 1.

Aggregate Flurry measures of app usage and App Store satisfaction ratings by platform.

Flurry measures	iOS	Android	Total
Mean # of sessions per user (mean)	6.8	5.2	6.3
Median time per session (seconds)	47.8a	47.6b	47.7
Mean total time of use (seconds)	325	250	301
Mean App Store ratinga	4.5	3.9	4.3

^aApp store ratings are based on a 5-star system where 5 stars is the highest possible rating that can be assigned; app ratings represent only a subset of total downloads with n=80 for iOS and n=329 for Android; Total app rating is weighted by number of downloads.

^aAverage for all health & fitness mobile apps tracked by Flurry for iOS=39.9 seconds

^bAverage for all health & fitness mobile apps tracked by Flurry for Android=31.7 seconds