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For each person and visit, we calculated individual 24-hr average exposures immediately preceding the clinical visit (lag 0) and up to 5 days before the visit (lag 1 lag 5).
Relative risk of ED visits was examined with respect to the exposure concentrations on the day of the visit (lag 0), a day prior to the visit (lag 1), and the average of the two (average over lags 0 and 1) and compared with AIC/BIC criterions.
The OR for the association between asthma emergency department visits and each 5°C increase in temperature on the day of the visit (lag 0) was 1.01 (95% CI: 1.00, 1.02).
In this panel study conducted among persons with coronary heart disease in three European cities, personal, indoor, or outdoor PM2.5 measured during the 24 hr preceding clinic visit (lag 0) were not associated with HRV.
Lag 0 concentration was defined as the 24-hr average from noon the previous day to noon of the day of the clinic visit; lag 1 concentration as the average concentration of the previous 24 hr, and so on.
We used moving averages of ambient concentrations of air pollutants and meteorogic variables to characterize the exposures by calculating the individual 24-hr average exposure for each person immediately preceding the clinical visit (lag 0) up to 4 days (lag 1 lag 4).
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However, ozone was associated with both asthma and COPD visits (lag 2).
Multivariate models that incorporated lags between spraying and ED visits for asthma of 2 6 days showed no increase in ED visits for asthma (e.g., multivariate RR for ED asthma visits lagged 5 days after exposure was 0.94; 95% CI, 0.82 1.08).
After including the number of emergency hospital visits at lag 1 as a variable, the autocorrelation function of residuals was found to be reasonable (Additional file 3).
We observed associations between daily average air pollution concentrations and emergency department visits with lags of zero to two days, but not for three hour average concentrations lagged up to 12 hours within the same day.
Mrs. Clinton, who seems uncannily resistant to jet lag, visited two community housing projects and danced with children, lugged some rocks into a wheelbarrow, planted flowers, planted a tree and beamed as a choir broke out into a song about her. "Hill-ar-eee, Hill-ar-eee!" the men and women sang, their faces glazed with sweat.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com