Table 4.
Risk-adjusted temporal trends in survival outcomes by community
| Risk-adjusted survival rate*, % |
Adjusted rate ratio per year† |
p For trend† | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | RR | 95% CI |
|||
| Total | ||||||||||
| Good neurological outcome | ||||||||||
| Seoul | 1.4 | 2.5 | 2.5 | 2.5 | 2.4 | 4.3 | 1.17 | 1.09 | 1.26 | <0.01 |
| Osaka | 3.6 | 5.5 | 4.8 | 5.1 | 4.7 | 5.1 | 1.03 | 1.00 | 1.07 | 0.08 |
| Survival to discharge | ||||||||||
| Seoul | 6.8 | 7.3 | 6.7 | 8.5 | 8.6 | 10.9 | 1.10 | 1.06 | 1.15 | <0.01 |
| Osaka | 7.2 | 9.0 | 8.1 | 8.6 | 8.0 | 8.2 | 1.01 | 0.98 | 1.03 | 0.53 |
| Witnessed | ||||||||||
| Good neurological outcome | ||||||||||
| Seoul | 1.9 | 3.5 | 3.7 | 3.8 | 3.7 | 6.9 | 1.21 | 1.11 | 1.32 | <0.01 |
| Osaka | 7.3 | 10.6 | 10.0 | 9.4 | 9.4 | 10.2 | 1.03 | 0.99 | 1.07 | 0.13 |
| Survival to discharge | ||||||||||
| Seoul | 8.1 | 9.8 | 9.1 | 12.4 | 12.8 | 15.5 | 1.14 | 1.08 | 1.19 | <0.01 |
| Osaka | 13.8 | 16.0 | 16.3 | 15.3 | 15.5 | 15.8 | 1.01 | 0.98 | 1.04 | 0.43 |
The model was adjusted for age and gender. There was no interaction.
*Risk-adjusted rates for each year were obtained by multiplying the observed rate for the reference year (2006) by the corresponding rate ratios from a model evaluating year as a categorical variable.
†Adjusted rate ratios per year and p for trends were calculated with a model evaluating year as a continuous variable.
RR, rate ratio.