Table 1.

Indicators integrated in the study.

Indicators	Data sources
COVID-19 vaccination rates & COVID-19 deaths	Worldometer [1], Our World in Data [2], WHO [73], Mathieu et al., 2021 [74]
Primary, secondary and tertiary education (%)	World Bank [75]
Stringency index (scaled between 0 and 100, with 100 meaning the highest strictness for applying government's measures to respond to COVID-19)	Oxford COVID-19 Government Response Tracker - Hale et al., 2021 [76]
GDP (expressed in PPP), elderly (65+) and comorbidities	World Bank/World Developmet Indicators [77]