Study dates	Main restrictions, Republic of Ireland (ROI)	Main restrictions, UK
Phase 0: pre-COVID-19	1 January–29 February	No restrictions in place	No restrictions
Phase 1	1 March–31 May	From 12 March, closure of schools, colleges and child care facilities. Limited outdoor gatherings and travel restricted to within 2 km radius. Hospital visits restricted. Pubs and restaurants closed	A national lockdown 23 March with closure of schools, colleges, non-essential shops, gradually loosening by middle to end May
Phase 2	1 June–31 August	Indoor gatherings of 50 people, outdoor up to 200. Summer camps open, sports and limited travel allowed. Restaurants and pubs open with some restrictions	UK go into phase 2, with re-opening of shops, schools, hospitality and outdoor leisure activities
Phase 3	1 September–30 November	Stay-at-home order re-enforced, essential retail only open, pubs and restaurants closed. No social gatherings and limitations on funerals and weddings. Exercise within 5 km of home. Schools and colleges open	Restriction gradually reintroduced from September on. Ban on indoor gatherings, curfew imposed, schools, eateries, pubs closed, with fines for breach of rules