Use case study

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  • Citation tools Download this article to citation manager Arfè Andrea , Scotti Lorenza , Varas-Lorenzo Cristina , Nicotra Federica , Zambon Antonella , Kollhorst Bianca et al. Non-steroidal anti-inflammatory drugs and risk of heart failure in four European countries: nested case-control study BMJ 2016; 354 :i4857
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    Data about how smartphone owners use their phones over the course of one week (Chapter 3) is taken from the American Trends Panel “experience sampling” survey, conducted November 10-16, 2014 among 1,635 respondents. Respondents were asked to complete two surveys per day for seven days (14 in total), using either an app they had installed on their phone (n=697) or by completing a web survey (n=938). All findings in this report are based on respondents who completed 10 or more surveys over the course of the week-long study period (n=1,035). The margin of sampling error for smartphone owners who completed 10 or more surveys is plus or minus percentage points. For more details about this survey, see Appendix C.

    Use case study

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