Changes in study outcomes from before to after declaration of a state of emergency
| Variables* | 2019 | 2020 | Percentage change in 2020 with respect to 2019 (95% CI) | ||||
| 18 Feb–6 Apr (n=1716) | 7 Apr–25 May (n=1518) | 18 Feb–6 Apr (n=1615) | 7 Apr–25 May (n=1494) | Crude | Model I† | Model II‡ | |
| Bystander CPR | 557 (32.5) | 511 (33.7) | 556 (34.4) | 656 (43.9) | 8.3 (3.6 to 13.0) | 9.3 (4.8 to 13.7) | 6.9 (2.8 to 11.1) |
| Prehospital ROSC | 177 (10.3) | 168 (11.1) | 118 (7.3) | 128 (8.6) | 0.5 (−2.4 to 3.3) | 0.4 (−2.3 to 3.2) | 0.5 (−2.3 to 3.2) |
| 1 month survival | 104 (6.1) | 114 (7.5) | 73 (4.5) | 66 (4.4) | −1.6 (−3.8 to 0.7) | −1.4 (−3.5 to 0.8) | −1.4 (−3.5 to 0.8) |
| 1 month CPC l or 2 | 58 (3.4) | 78 (5.1) | 43 (2.7) | 40 (2.7) | −1.7 (−3.5 to 0.1) | −1.5 (−3.2 to 0.1) | −1.5 (−3.3 to 0.2) |
*Data are presented as number (%).
†Model I was adjusted for age (categorised into quartiles), sex, site of cardiac arrest (private residence or not), witness (family member, EMS personnel, healthcare provider, friend, other or none), presumed aetiology (cardiogenic or non-cardiogenic), year (2019 or 2020), period (18 February to 6 April or 7 April to 25 May) and year–period interaction term.
‡In addition to covariates in Model I, Model II was adjusted for call-to-response time (categorised into quartiles) and dispatcher instructions regarding CPR (yes or no).
CPC, cerebral performance category; CPR, cardiopulmonary resuscitation; EMS, emergency medical services; ROSC, return of spontaneous circulation.