The effect of coarse ambient particulate matter on first, second, and overall hospital admissions for respiratory disease among the elderly.

摘要: The objective of this article is to examine differences in the effect ambient particulate matter on first, second, and overall hospital admissions for respiratory disease among elderly. We studied 8989 adults 65 yr age or older living greater Vancouver area who were admitted any acute (ICD-9 codes 460-519) between June 1, 1995, March 31, 1999. Time-series analysis was used evaluate association daily measures (PM10, PM2.5, PM10 - 2.5) urban air, after adjustment gaseous copollutants (CO, O3, NO2, SO2) meteorological variables. Repeated common Approximately 30% subjects readmitted first admission; 9% had more than 2 during 4-yr study period. 2.5 significantly associated with second disease, but not admission. adjusted relative risks an increment 4.2 microg/m(3) -day average concentrations 1.03 (95% confidence interval: 0.98-1.09) admission, 1.22 (1.10-1.36) 1.06 (1.02, 1.11) admissions. There no significant PM2.5 Our data suggest that (1) people a history are at higher risk relation air pollution areas, (2) analyses based rather repeated lead lower estimates pollution, (3) has larger PM2.5.