Table 2.
Associations with cardiac arrest and acute coronary syndrome calls among those aged 16–39 using a negative binomial regression model, with and without stepwise BIC feature selection.
| Variable | With stepwise BIC selection | Without feature selection | ||
|---|---|---|---|---|
| Adjusted incidence rate ratio (95% CI) | P-value | Adjusted incidence rate ratio (95% CI) | P-value | |
| The bi-weekly cumulative counts of 1st and 2nd vaccine doses in the age group 16–39, normalized by the respective population size | 3.32 (2.12–5.14) | < 0.001 | 2.20 (1.06–4.56) | < 0.05 |
| The three-week cumulative new COVID-19 infection count among the age group 16–39, normalized by the respective population size | – | – | 26.94 (0.03–20,067.17) | 0.330 |
| Call type: Acute coronary syndrome | 1 [Reference] | – | 1 [Reference] | – |
| Call type: Cardiac arrest | 0.24 (0.22–0.25) | < 0.001 | 0.24 (0.22–0.25) | < 0.001 |
| Week not during a COVID-19 public health advisory | 1 [Reference] | – | 1 [Reference] | – |
| Week during a COVID-19 public health advisory | – | – | 0.94 (0.85–1.04) | 0.224 |
| Year: 2019 | 0.88 (0.83–0.94) | < 0.001 | 0.83 (0.75–0.92) | < 0.001 |
| Year: 2020 | – | – | 0.94 (0.84–1.05) | 0.245 |
| Year: 2021 | 1 [Reference] | – | 1 [Reference] | – |
BIC Bayesian information criterion, CI confidence interval, COVID-19 coronavirus disease 2019.