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Table 1 Basic characteristics of included apps

From: The evolution of mobile apps for asthma: an updated systematic assessment of content and tools

  2011 (n = 78) New 2013 (n = 92) ¤ All 2013 (n = 147) ¤
Characteristic Yes % Yes % Yes %
Platform       
Android only 32 41% 52 57% 73 50%
iOS only 40 51% 28 30% 57 39%
Both 6 8% 12 13% 17 12%
Cost       
Free 26 33% 59 64% 80 54%
Paid-for 52 67% 33 36% 67 46%
Median £1.27 £0.89 £1.12
Country of origin       
US 24 31% 31 34% 52 35%
UK 5 6% 6 7% 8 5%
India 7 9% 7 8% 8 5%
Australia 3 4% 4 4% 7 5%
Other 10 13% 24 26% 33 22%
Unknown 29 37% 20 22% 39 27%
Content orientation       
Conventional medicine only 56 72% 59 64% 101 69%
Complementary/alternative medicine only 15 19% 17 18% 26 18%
Mixed 7 9% 16 17% 20 14%
Audience targeting       
Children or young adults 2 3% 7 8% 8 5%
Parents or caregivers 3 4% 15 16% 19 13%
No audience stated 73 94% 73 79% 123 84%
Other features       
Adverts 14 18% 31 34% 39 27%
Social sharing 13 17% 35 38% 61 41%
Cloud storage 3 4% 10 11% 16 11%
Clinical disclaimer 32 41% 37 40% 55 37%
In-app help 14 18% 28 30% 43 29%
Online help 5 6% 6 7% 10 7%
  1. ¤ New 2013, Apps available in 2013 that were not available in 2011; All 2013, All apps available in 2013, excluding those available in 2011 that were subsequently discontinued.
  2. Four countries with highest overall number of apps in 2013 shown. Other countries were: Ireland (n = 5), Germany (n = 4), Switzerland (n = 4), Japan (n = 3), Romania (n = 2), Singapore (n = 2), Austria (n = 1), France (n = 1), Italy (n = 1), Norway (n = 1), Poland (n = 1), Portugal (n = 1), Spain (n = 1), and Sweden (n = 1).
  3. Audience targeting was identified by specific claims made in the app title or description or content. We found no cases where apps explicitly indicated they were intended for adult use only. A small number of apps targeted both children and a parent or caregiver (2011, n = 0; New 2013, n = 3; All 2013, n = 3).
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