Table 3.

Characteristics of sources of evidence from different European countries

Author(s) and year	Population	Concept	Context
Stroetmann and Erkert 1999 [54]	17 mobility-impaired older people (aged 75 to over 90)	Videophone service (HausTeleDienst). The clients were connected to the service centre using a standard cable-TV network	Homecare in Germany
Marcellini et al. 2000 [43]	1007 older people with different health conditions (aged 75 years and older). In addition, younger age-group	Ticket machines, automatic teller machine and phones that use phone cards	Outdoor environment in Germany, Finland and Italy
Perle 2012 [51]	75-year-old lady. In addition, 20-year-old lady	The internet	Test-centre in Estonia
Wessmann et al. 2013 [53]	22 older people (aged between 75 and 90 years)	Technology used by older people (for example computer, phone), information technology	Home surroundings in Finland
Zsiga et al. 2013 [44]	11 older people (aged between 77 and 85 years). In addition, caregivers	Robot. The functions demonstrated included speech recognition, navigation, reminder function, shopping list creation and video conferencing	Test-centre in Austria, France and Hungary
La Tona et al. 2017 [55]	4 older people presenting a wide range of age-related disorders (aged between 87 and 89 years)	Robot with voice, gesture and touch interfaces.	Test-centre in Italy
Adamsoo 2018 [52]	5 older people (aged between 75 and 81 years). In addition, younger age-group	Smartphone	Home setting in Estonia