Overall daily records (with 95% CI) from negative binomial models split by inpatients and outpatients, pre and post COVID-19 and tiering system
| Inpatients | Outpatients | |||
| Weekday | Holiday | Weekday | Holiday | |
| Pre COVID-19 | 157 (153.5 to 160.5) | 44.6 (42.7 to 46.5) | 257.6 (243.5 to 272.4) | 11.9 (10.7 to 13.2) |
| Post COVID-19 (overall) | 155.4 (152.3 to 158.7) | 53.4 (51.4 to 55.4) | 187.3 (177.8 to 197.3) | 8.2 (7.4 to 9.1) |
| Lockdown tier 0 | 157 (153.6 to 160.5) | 44.6 (42.7 to 46.5) | 257.6 (244.1 to 271.7) | 11.9 (10.8 to 13.1) |
| Lockdown tier 1 | 153.8 (148 to 159.8) | 46.7 (43.5 to 50.3) | 213.6 (194.6 to 234.5) | 7.5 (6.2 to 9) |
| Lockdown tier 2 | 164.2 (157.4 to 171.3) | 54.1 (49.9 to 58.7) | 224.7 (202.6 to 249.3) | 9.3 (7.5 to 11.5) |
| Lockdown tier 3 | 152.9 (139.2 to 168) | 62.2 (51.5 to 75.2) | 151.5 (120.2 to 190.9) | 9.5 (5.7 to 15.7) |
| Lockdown tier 4 | 152.2 (147.7 to 157) | 56.1 (53.3 to 59.1) | 154.8 (143.6 to 166.9) | 8.1 (7 to 9.3) |
Post COVID-19 dates were defined as all dates after and including Monday 23 March 2020, when the first national lockdown came into force in the UK. Post COVID-19 dates were further subcategorised according to the UK government’s official lockdown tiering system (tiers 0–4, based on local tiering allocation in London with tier 4 being the most stringent form of lockdown). Although the tiering system was announced in October 2020, we retrospectively categorised all post- COVID-19 restrictions in London prior to October 2020 according to the same system as follows: tier 4 from the 23 March 2020; on 1 June 2020, lockdown restrictions eased with primary schools reopening (tier 3); on 14 June 2020, non-essential shops reopened (tier 2) and on 4 July 2020, other businesses reopened such as pubs and restaurants (tier 1).6