These unified methods include community monitored pollutant levels, studies of indoor and outdoor levels in homes and schools; step counters; questionnaire-based data on time activity patterns including commuting patterns, traffic patterns, and housing characteristics; and appropriate accounting of uncertainty in the exposure estimates.
Our sensitivity analysis tended to indicate that had birth weights < 2,500 g been included, the associations between air pollutant levels and birth weight may have been somewhat weaker, without substantial alteration of the monotonous association.
The exposed group included women who had two or more pollutant levels higher than the 75th percentile of distribution, and the nonexposed group included those with none or only one pollutant level higher than the 75th percentile.
Additionally, spatio-temporal modeling methods have also been developed which include LUR covariates [ 14, 15] to model air pollutant levels at unmeasured locations.
However, the findings do underscore the importance of including gestational age at amniocentesis in statistical analyses of environmental pollutant levels in amniotic fluid.
Pollutant levels in Hells Canyon upstream of the Salmon River confluence, including that of water temperature, dissolved nutrients, and sediment, are required to meet certain levels.
Pollutants were included in the models as the moving average of lags 0 2, and risk ratios were calculated per approximate standard deviation increase in pollutant levels.
Devices placed in their homes measured air pollutant levels.
"We know the pollutant levels exceed the guidelines so we need to bring them back down.
The model captures gradients in pollutant levels across the city and also describes the exponential decay of pollutant levels downwind of the city.
