Association of dust events with daily respiratory hospitalization

Objective To explore the association of dust events with daily respiratory hospitalization.Methods After controlling long time trend,calendar effect and other meteorological confouding factors,a semi-parametric generalized additive model(GAM)considered simultaneously the effects of dust events up to lags of 7 days was fit to explore the relationship between dust events and daily respiratory hospitalization from 1994 to 2003.At the same time,the association for different sex groups was assessed.Results (1)There were 3-day delayed effect of dust events on total daily respiratory hospitalization and upper respiratory tract infcetion(URTI),their relative risk(RR)were 1.14(95% CI=1.02～1.27)and 1.16(95% CI=1.00～1.36)respectively.(2)There were 3-day delayed effect on both male and female of total daily respiratory hospitalization,their RR were1.14(95% CI=1.01～1.29)and 1.18(95% CI=1.00～1.41)respectively,but only 4-day delayed effect on male of U R TI and 6-day delayed effect on male of pneumonia were found,their RR were 1.28(95% CI=1.04～1.59)and 1.17(95% CI=1.00～1.38)respectively.Conclusion There are the delayed effects of dust events on various daily respiratory hospitalizations;moreover,for URTI and pneumonia,there are close associations of dust events with male hospitalizations than females.