Evidence base
OECD
Social Connections and Loneliness in OECD Countries

What it found
This OECD flagship report presents cross-country data on social connectedness across OECD countries, finding that on average 10% of people feel unsupported, 8% report no close friends, and 6% experienced loneliness most or all of the past four weeks. In-person meeting frequency has declined over a longer period, while self-reported connection has worsened more recently, with men and young people -- previously considered lower risk -- showing some of the largest deteriorations. The report also examines social infrastructure and digitalisation as drivers, and discusses measurement implications, building on the OECD's How's Life? 2024 work.
Why it matters for practice
This is the most complete cross-country comparison of social connectedness currently available, useful as a baseline for anyone benchmarking national or local prevalence figures. Read the finding on men and young people carefully: it should prompt a check of whether your own targeting assumptions still hold, rather than being taken as settled cause-and-effect.