As a starting point, this report draws on the same indicators and sources used in the How’s Life? 2020 report. This is feasible for some aspects of material well-being and economic capital in particular, as well as for data from the Gallup World Poll, used in the absence of harmonised official data sources for a limited number of indicators. However, for other outcomes, the report relies on a number of ad-hoc studies and new data collections that have emerged during the crisis. At the national level, these sources range from experimental time use studies (UK Office of National Statistics) to ‘crowdsourced’ mental health data (Statistics Canada), a Household Pulse Survey (United States Census Bureau), and the SOEP-Cov study in Germany. In other cases, existing data collections have been adapted – for example, Stats NZ introduced supplemental well-being questions in the Household Labour Force Survey in 2020, providing quarterly estimates of outcomes such as life satisfaction. At the international level, novel data collections include the Eurofound Living, Working and COVID-19 Study; the Imperial College London/YouGov COVID-19 Public Monitor; and the REpresentations, PErceptions and ATtitudes on COVID-19 (REPEAT) survey from Sciences Po. Within the OECD, existing data collections such as the Risks That Matter survey have been adapted to address COVID-19 relevant concerns.
Several of the data sources used in the Evidence Scan build on existing survey vehicles and questionnaire items, but in some cases, the absence of comparable baseline data makes it difficult to provide an accurate account of pandemic impacts. The uneven and intersectional impacts of the pandemic across the population emphasise the need for large-sample representative studies that enable data to be disaggregated and cross tabulated with confidence – which is not always possible for smaller ad hoc studies. At the same time, the process of data collection has itself been heavily disrupted by the pandemic. For example, several data producers switched from face-to-face to other survey modes. The exceptional circumstances also mean that online-only methods and unconventional sampling strategies have occasionally been adopted (e.g. convenience sampling methods used for the Eurofound study). Post-hoc adjustments to survey weights are often applied to correct for the most easily addressed sources of bias, but these methods do not fully address the non-representativeness of the data when, for example, respondents are self-selecting.
Due to the constraints of the available data, some OECD countries have better coverage than others, direct country comparisons are not always feasible, and good 2019 baseline data are often lacking. It is also not possible to apply the more rigorous data quality standards adopted in How’s Life? throughout this report. Instead, the chapters include brief boxes that describe key data sources, and results should be interpreted with these methodological details in mind.