Table 3.

Social interactions and contacts.

Intervention	Online group or one-to-one	Contacts	Contact with research staff
Ballantyne et al. [30]	Online group	Family and friends, new people	Weekly visits first, then fewer; phone calls at most 1 h/week
Blažun et al. [32]	Online group	Family and friends, new people	Training once a week; 4 h in Finland and 3 h in Slovenia
Cattan et al. [43]	One-to-one	Volunteers (predefined)	Variable number of weekly calls
Cotten et al. [34]	Online group	Family and friends, new people	Eight-week training (data from first 2 weeks)
Dodge et al. [44]	One-to-one	Predefined (trained interviewers)	Video chat 30–35 min/day; 5 days/week
Fokkema and Knipscheer [41]	Online group	Family and friends, new people, other participants, acquaintances	5 × 2 h lessons; visits every 2–3 weeks
Garattini et al. [45]	Online group	Family and friends, other participants	4 × 1 h visits; messages via app; weekly calls (extra calls for technical issues)
Larsson et al. [39]	Online group	Family and friends, new people, and other participants	Individual meeting offered weekly, group meeting every 2 weeks
Machesney et al. [40]	One-to-one	Predefined (trained helpers)	Visits and phone calls, available 24/7
Széman et al. [41]	Online group	Family and friends, new people, and acquaintances	1 × 1.5 h lesson; 1 h visits twice a week
White et al. [42]	Online group	Family and friends, new people	3 × 2 h lessons, three 1 h lessons; trainer visits 2 h/week
Baez et al. [46]	Online group	Other participants, predefined (coach)	1.5 h training model before baseline; support messages/calls
Czaja et al. [35]	Online group	Family and friends, other participants	Initial setup, 3x check visits, calls at week 1, months 3 and 9
Banbury et al. [47]	Online group	Family and friends, predefined (facilitator), and other participants	Minimal training
Barbosa et al. [48]	One-to-one	Family and friends, acquaintances	Individual training at before deployment; weekly support visits
Chiu and Wu [33]	Online group	Family and friends	90-min ICT training sessions weekly for 12 weeks
Gutierrez et al. [36]	Online group	Family and friends	Unaccounted frequency, support provided by family member
Isaacson et al. [49]	Online group	Family and friends, other participants	Visit for setup and training and after 4–5 weeks
Jarvis et al. [37]	Online group	Family and friends, predefined (facilitator)	8x 90-min training session (during first 4 weeks), then weekly support visits
Jarvis et al. [38]	Online group	Family and friends, other participants	2x 90-min training session/week over 15 days, then weekly support visits
Morton et al. [50]	Online group	Family and friends, other participants, and acquaintances	3x 90-min training/week (month 1); session every 2 weeks, 1 h remote support alternate weeks (month 2), then 1 month of remote support and no visits
Myhre et al. [51]	Online group	Other participants	3 × 2 h training session for a week
Barbosa et al. [52]	One-to-one	Family and friends	1x individual training session, then weekly visits
Pauly et al. [53]	Online group	Family and friends	2x training sessions before intervention, 3 h customized workshop during intervention
Tomasino et al. [54]	Online group	Other participants, predefined (coach)	Remote support throughout the study