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* The source defines income as personal net income divided into three categories: low income defined as the country-specific bottom third of the personal income allocation; medium income defined as the country-specific average third of the personal income allocation; high income defined as the country-specific top third of the personal income allocation .

The Fitness segment contains the user and revenue development of two product categories: (1) portable, connected fitness devices (“Wearables”) and (2) digital fitness and nutrition applications for use with a smartphone and/or tablet (“Apps”).

The “Wearables” segment includes devices that are explicitly intended for fitness. In particular, fitness wristwear which is equipped with sensors and activity trackers that measure and analyze the physical activity and body functions of the wearer (e.g. number of steps taken, movement, pulse and temperature). Well-known examples of fitness wearables are the fitness bands from fitbit, Jawbone, the Chinese manufacturer Xiaomi, and the Nike Fuelband. Smartwatches are not considered here as dedicated fitness equipment; therefore they are excluded from the market segment. However, in the future it is expected that there will be an increasing convergence of smartwatches and fitness bands.
Further information on methodology can be found