Table 4 Percentage changes with 95% confidence intervals (95% CIs) in emergency room visits associated with a 10 μg/m3 increase in ozone concentrations for different lag structures.
From: Short-term Effect of Ambient Ozone on Daily Emergency Room Visits in Beijing, China
Hospital service | Lag days | Percentage change | 95% CI | P |
The whole study period | Lag 0 day | 0.24 | 0.21–0.26 | <2e-16 |
Lag 1 day | 0.09 | 0.06–0.11 | 4.23e-13 | |
Lag 2 day | 0.06 | 0.04–0.09 | 4.59e-09 | |
Lag 3 day | 0.05 | 0.03–0.08 | 3.78e-07 | |
Lag 4 day | 0.01 | −0.02–0.03 | 0.575 | |
Lag 0–4 day | 0.23 | 0.19–0.26 | <2e-16 | |
Days that meet Grade II standard | Lag 0 day | 0.31 | 0.27–0.35 | <2e-16 |
(160 μg/m3) | Lag 1 day | 0.06 | 0.03–0.09 | 0.000106 |
Lag 2 day | 0.07 | 0.04–0.09 | 7.57e-07 | |
Lag 3 day | 0.08 | 0.05–0.11 | 3.46e-09 | |
Lag 4 day | 0.02 | −0.01–0.05 | 0.442 | |
Lag 0–4 day | 0.27 | 0.22–0.31 | <2e-16 | |
Days that meet Grade I standard | Lag 0 day | 0.43 | 0.36–0.50 | <2e-16 |
(100 μg/m3) | Lag 1 day | 0.16 | 0.11–0.20 | 2.7e-10 |
Lag 2 day | −0.01 | −0.05–0.03 | 0.583 | |
Lag 3 day | 0.02 | −0.02–0.06 | 0.298 | |
Lag 4 day | 0.02 | −0.02–0.06 | 0.322 | |
Lag 0–4 day | 0.21 | 0.14–0.29 | 5.2e-08 |
