Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Pooled associations between air pollutants and out-of-hospital cardiac arrest morbidity. Excess risks (ERs) are for an increase of 10 μg/m3 of particulate matter, 0.1 ppm of CO, and 10 ppb of other gaseous pollutants. I2 statistic represents the proportion of total variation between effect estimates due to heterogeneity. The p-value is based on Cochran's Q test.
