Trends in survival and neurological outcomes of patients with out-of-hospital cardiac arrest in urban areas of Beijing
| Outcome | Risk-adjusted rates* (%) | Adjusted rate ratio per year (95% CI)† | P value for trend† | ||||
| 2013 | 2014 | 2015 | 2016 | 2017 | |||
| ROSC | 4.18 | 5.25 | 6.55 | 6.60 | 6.26 | 1.10 (1.02 to 1.19) | 0.01 |
| Survival to admission | 3.58 | 4.49 | 5.48 | 4.69 | 4.96 | 1.07 (0.98 to 1.17) | 0.15 |
| Survival to discharge | 1.24 | 1.70 | 1.86 | 1.67 | 1.60 | 1.04 (0.89 to 1.23) | 0.60 |
| CPC at discharge | 0.87 | 1.49 | 1.73 | 1.61 | 0.97 | 1.02 (0.87 to 1.19) | 0.85 |
| Survived to 1 year | 0.88 | 1.07 | 1.13 | 1.15 | 0.82 | 0.99 (0.80 to 1.23) | 0.92 |
| CPC at survival to 1 year | 0.79 | 0.42 | 1.15 | 1.09 | 0.53 | 0.99 (0.81 to 1.20) | 0.89 |
*The risk-adjusted rates of ROSC, survival to admission, survival to discharge, CPC at discharge, survival to 1 year and CPC at survival to 1 year for each calendar year are reported for the overall cohort. The rates were adjusted for temporal changes in the patient and hospital characteristics. The risk-adjusted rates for each calendar year were obtained by multiplying the observed rate for the reference year (2013) by the corresponding rate ratios for 2014–2017 from a model that evaluated each calendar year as a categorical variable.
†The adjusted risk ratios and p values for the trends were determined with a model that evaluated each calendar year as a continuous variable.
CPC, cerebral performance category; ROSC, return of spontaneous circulation.