Ontology highlight
ABSTRACT:
SUBMITTER: Kunzli N
PROVIDER: S-EPMC1757056 | biostudies-literature | 2005 Jun
REPOSITORIES: biostudies-literature
Journal of epidemiology and community health 20050601 6
The exposure term in the case-crossover design consists in the difference between the ambient concentration on the event day and the concentration(s) on some control day(s). So far, all air pollution case-crossover studies presented the distribution of the daily ambient pollutant concentrations but do not publish the distributional properties of the relevant exposure term--that is, the concentration difference. This article shows that this difference can be very small for a large fraction of eve ...[more]