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In the analysis of non-DOA cases, the number of dropped cases varied with daily lag and ranged from 26 to 31 (of 1,374).
Similarly, daily lag 0, 1, and 2-day average size-fractionated PM mass concentrations also were not significantly associated with 24-hr SDNN (data not shown).
Now researchers report their findings on the daily lag patterns between exposure to individual PM2.5 constituents and hospital admissions for various conditions [ EHP 120 8):1094 1099; Kim et al.].
However, it has been difficult to investigate the daily lag structure of the association between particulate matter constituents and health outcomes because most U.S. studies have relied on U.S. Environmental Protection Agency EPAA) regulatory monitoring data derived from networks using every third or sixth day sampling schedules.
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A new study suggests a quick fix for those daily lags in energy.
We included time factors and daily lagged weather predictors.
Similar models have been used to look at the effect of daily lags in air pollution exposure and mortality (Goodman et al. 2004; Schwartz 2000).
We evaluated the lag structure of the association between PMx concentrations and daily counts of cause-specific hospitalizations by applying cubic polynomial distributed lag models, with individual daily lags from lag 0 to 5 entered simultaneously in the model and constrained to follow a polynomial shape.
We also explored a possible acute effect of these pollutants by narrowing the exposure window to a 1-day interval before birth, with daily lags ranging from 1 to 7 days.
Methods: Using a time-series design and distributed lag nonlinear models, we estimated the relative risk (RR) of kidney stone presentation associated with mean daily temperatures, including cumulative RR for a 20-day period, and RR for individual daily lags through 20 days.
Since no time point within 24 h was sampled in our study, the possibility of sub-daily lag phase of N2 production could not be excluded.
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