Table 3 Percentage changes with 95% CIs in outpatient and inpatient visits for chronic obstructive pulmonary disease (COPD) associated with an interquartile range increases in fine particulate matter (PM2.5) concentration (90.8 μg/m3) for different lag structures
Hospital service | Lag days | Percentage change | 95% CI | P |
|---|---|---|---|---|
Outpatient visits | Lag 0 days | 2.38 | 2.22–2.53 | <2e-16 |
|  | Lag 1 days | 0.19 | 0.06–0.33 | 0.00485 |
|  | Lag 2 days | 0.87 | 0.75–1.00 | <2e-16 |
|  | Lag 3 days | 1.57 | 1.44–1.69 | <2e-16 |
|  | Lag 0–1 days | 1.62 | 1.44–1.79 | <2e-16 |
|  | Lag 0–2 days | 1.81 | 1.64–2.00 | <2e-16 |
|  | Lag 0–3 days | 2.43 | 2.23–2.62 | <2e-16 |
Inpatient visits | Lag 0 days | 6.03 | 5.19–6.87 | <2e-16 |
|  | Lag 1 days | 2.41 | 1.69–3.14 | 4.46e-11 |
|  | Lag 2 days | 1.29 | 0.63–1.96 | 0.000119 |
|  | Lag 3 days | 0.21 | −0.44-0.86 | 0.527 |
|  | Lag 0–1 days | 5.61 | 4.68–6.54 | <2e-16 |
|  | Lag 0–2 days | 5.06 | 4.09–6.05 | <2e-16 |
|  | Lag 0–3 days | 4.33 | 3.31–5.36 | <2e-16 |