Title: The effects of ambient air pollution on school absenteeism due to respiratory illnesses.
Authors: Gilliland, F D; Berhane, K; Rappaport, E B; Thomas, D C; Avol, E; Gauderman, W J; London, S J; Margolis, H G; McConnell, R; Islam, K T; Peters, J M
Published In Epidemiology, (2001 Jan)
Abstract: We investigated the relations between ozone (O3), nitrogen dioxide (NO2), and respirable particles less than 10 microm in diameter (PM10) and school absenteeism in a cohort of 4th-grade school children who resided in 12 southern California communities. An active surveillance system ascertained the numbers and types of absences during the first 6 months of 1996. Pollutants were measured hourly at central-site monitors in each of the 12 communities. To examine acute effects of air pollution on absence rates, we fitted a two-stage time-series model to the absence count data that included distributed lag effects of exposure adjusted for long-term pollutant levels. Short-term change in O3, but not NO2 or PM10, was associated with a substantial increase in school absences from both upper and lower respiratory illness. An increase of 20 ppb of O3 was associated with an increase of 62.9% [95% confidence interval (95% CI) = 18.4-124.1%] for illness-related absence rates, 82.9% (95% CI = 3.9-222.0%) for respiratory illnesses, 45.1% (95% CI = 21.3-73.7%) for upper respiratory illnesses, and 173.9% (95% CI = 91.3-292.3%) for lower respiratory illnesses with wet cough. The short-term effects of a 20-ppb change of O3 on illness-related absenteeism were larger in communities with lower long-term average PM10 [223.5% (95% CI = 90.4-449.7)] compared with communities with high average levels [38.1% (95% CI = 8.5-75.8)]. Increased school absenteeism from O3 exposure in children is an important adverse effect of ambient air pollution worthy of public policy consideration.
PubMed ID: 11138819
MeSH Terms: Absenteeism*; Air Pollutants/analysis; Air Pollution/adverse effects*; Child; Cohort Studies; Female; Humans; Los Angeles/epidemiology; Male; Nitric Oxide/analysis; Ozone/analysis; Respiratory Tract Diseases/epidemiology; Respiratory Tract Diseases/etiology*; Schools