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Table 3 Hazard Ratio (HR) and 95% Confidence Interval (CI) for 10 mg/m3 increase in PM10 for the year of failure and for the distributed lag from the year of failure up to 3 previous years, across the 34 cities

From: Particulate air pollution and survival in a COPD cohort

  HR 95% CI P-values
PM 10 annual 1.11 1.06 1.15 0.000
Distributed lag model     
Lag 0 1.03 1.00 1.07 0.046
Lag 1 1.06 1.03 1.10 0.000
Lag 2 1.07 1.05 1.09 0.000
Lag 3 1.03 1.01 1.05 0.001
Sum lags 0–3 1.22 1.17 1.27 0.000