Skip to main content
. Author manuscript; available in PMC: 2019 Feb 20.
Published in final edited form as: J Expo Sci Environ Epidemiol. 2018 Jun 19;29(2):267–277. doi: 10.1038/s41370-018-0048-7

Table 3.

City-specific rate ratios and 95% confidence intervals per 25 ppb increment in 8-hr maximum ambient O3 from linear C-R models for four respiratory ED outcomes

City RD Asthma URI COPD
RR (95% CI) P-value RR (95% CI) P-value RR (95% CI) P-value RR (95% CI) P-value
Atlanta 1.03 (1.01-1.05) <0.01 1.04 (1.02-1.07) <0.01 1.03 (1.01-1.05) <0.01 1.00 (0.96-1.04) 0.963
Birmingham 1.03 (1.00-1.06) 0.023 1.04 (0.98-1.11) 0.151 1.03 (0.99-1.06) 0.114 0.99 (0.92-1.07) 0.844
Dallas 1.05 (1.02-1.07) <0.01 1.04 (1.00-1.08) 0.047 1.06 (1.03-1.09) <0.01 1.05 (0.99-1.11) 0.110
Pittsburgh 1.03 (1.01-1.05) <0.01 1.04 (1.01-1.08) 0.023 1.03 (1.00-1.06) 0.072 1.03 (0.98-1.09) 0.246
St. Louis 1.02 (1.01-1.04) 0.011 1.07 (1.03-1.11) <0.01 1.01 (0.99-1.04) 0.269 1.04 (0.98-1.10) 0.177
P-value testing whether city RRs differ3 0.748 0.765 0.184 0.564
a

P-values from chi-square tests of city heterogeneity