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BackgroundLoneliness is a serious public health issue, and its burden is increasing in many countries. Loneliness affects social, physical, and mental health, and it is associated with multimorbidity and premature mortality. In addition to social interventions, a range of digital technology interventions (DTIs) are being used to tackle loneliness. However, there is limited evidence on the effectiveness of DTIs in reducing loneliness, especially in adults. The effectiveness of DTIs in reducing loneliness needs to be systematically assessed. ObjectiveThe objective of this study is to assess the effectiveness of DTIs in reducing loneliness in older adults. MethodsWe conducted electronic searches in PubMed, MEDLINE, CINAHL, Embase, and Web of Science for empirical studies published in English from January 1, 2010, to July 31, 2019. The study selection criteria included interventional studies that used any type of DTIs to reduce loneliness in adults (aged ≥18 years) with a minimum intervention duration of 3 months and follow-up measurements at least 3 months after the intervention. Two researchers independently screened articles and extracted data using the PICO (participant, intervention, comparator, and outcome) framework. The primary outcome measure was loneliness. Loneliness scores in both the intervention and control groups at baseline and at follow-up at 3, 4, 6, and 12 months after the intervention were extracted. Data were analyzed via narrative synthesis and meta-analysis using RevMan (The Cochrane Collaboration) software. ResultsA total of 6 studies were selected from 4939 screened articles. These studies included 1 before and after study and 5 clinical trials (4 randomized clinical trials and 1 quasi-experimental study). All of these studies enrolled a total of 646 participants (men: n=154, 23.8%; women: n=427, 66.1%; no gender information: n=65, 10.1%) with an average age of 73-78 years (SD 6-11). Five clinical trials were included in the meta-analysis, and by using the random effects model, standardized mean differences (SMDs) were calculated for each trial and pooled across studies at the 3-, 4-, and 6-month follow-ups. The overall effect estimates showed no statistically significant difference in the effectiveness of DTIs compared with that of usual care or non-DTIs at follow-up at 3 months (SMD 0.02; 95% CI −0.36 to 0.40; P=.92), 4 months (SMD −1.11; 95% CI −2.60 to 0.38; P=.14), and 6 months (SMD −0.11; 95% CI −0.54 to 0.32; P=.61). The quality of evidence was very low to moderate in these trials. ConclusionsOur meta-analysis shows no evidence supporting the effectiveness of DTIs in reducing loneliness in older adults. Future research may consider randomized controlled trials with larger sample sizes and longer durations for both the interventions and follow-ups. International Registered Report Identifier (IRRID)RR2-10.1136/bmjopen-2019-032455

The focus of this perspective is on lockdown loneliness, which we define as loneliness resulting from social disconnection as a result of enforced social distancing and lockdowns during the COVID-19 pandemic. We also explore the role of digital technology in tackling lockdown loneliness amid the pandemic. In this regard, we highlight and discuss a number of the key relevant issues: a description of lockdown loneliness, the burden of lockdown loneliness during the COVID-19 pandemic, characteristics of people who are more likely to be affected by lockdown loneliness, factors that could increase the risk of loneliness, lockdown loneliness as an important public health issue, tackling loneliness during the pandemic, digital technology tools for social connection and networking during the pandemic, assessment of digital technology tools from the end users’ perspectives, and access to and use of digital technology for tackling lockdown loneliness during the COVID-19 pandemic. We suggest that the most disadvantaged and vulnerable people who are more prone to lockdown loneliness are provided with access to digital technology so that they can connect socially with their loved ones and others; this could reduce loneliness resulting from social distancing and lockdowns during the COVID-19 crisis. Nonetheless, some key issues such as access to and knowledge of digital technology tools must be considered. In addition, the involvement of all key stakeholders (family and friends, social care providers, and clinicians and health allied professionals) should be ensured.