Table 4

Association of cumulative air pollution exposure and mortality

ExposureIncreaseHR (95% CI)p Value
O310 µg/m30.89 (0.66 to 1.18)0.43
NO210 µg/m31.01 (0.79 to 1.29)0.90
PM1010 µg/m32.01 (1.07 to 3.77)0.03
PM2.510 µg/m37.93 (2.93 to 21.33)<0.001

  • Cox proportional hazards model adjusted on age, FVC% predicted at base line and DLco% predicted at base line and smoking status.

  • NO2, nitrogen dioxide; O3, ozone; PM10 and PM2.5, particles with a 50% cut-off aerodynamic diameter of 10 µm and 2.5 µm.