Table 3 Outcomes from the ITS analysis projecting the impact of the first national lockdown (‘lockdown’) to suppress COVID-19 during the spring of 2020 on the overcrowding metrics and considering all attendances and those arriving by ambulance or walking in. The study period (over the period January 12, 2020-August 11, 2020) is split into three time periods of 71 days defined as before the first national lockdown (January 12, 2020-March 22, 2020) (‘before’), during the first national lockdown (March 23, 2020-May 31, 2020) (‘lockdown’) and after the first national lockdown (June 01, 2020-August 11, 2020)(‘after’)
Impact of COVID-19 lockdown on all people attending UCLH ED | ||
|---|---|---|
Intervention | IRR (95% CI) | p-value |
 Lockdown VS before lockdown | 0.346 (0.324,0.369) | < 0.001 |
 After lockdown VS lockdown | 1.496 (1.417,1.576) | < 0.001 |
Impact of COVID-19 lockdown people arriving by ambulance to UCLH ED | ||
 Lockdown VS before lockdown | 0.473 (0.443,0.505) | < 0.001 |
 After lockdown VS lockdown | 1.285 (1.211,1.362) | < 0.001 |
Impact of COVID-19 lockdown people walking-in the UCLH ED | ||
 Lockdown VS before lockdown | 0.308 (0.287,0.331) | < 0.001 |
 After lockdown VS lockdown | 1.596 (1.506,1.692) | < 0.001 |
Impact of COVID-19 lockdown in % of people leaving within 4 h of arrival | ||
 Lockdown VS before lockdown | 1.059 (1.034,1.085) | < 0.001 |
 After lockdown VS lockdown | 1.075 (1.053,1.098) | < 0.001 |
Impact of COVID-19 lockdown on average waiting time | ||
 Lockdown VS before lockdown | 0.876 (0.839,0.915) | < 0.001 |
 After lockdown VS lockdown | 0.868 (0.837,0.899) | < 0.001 |