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Time Series Study of Air Pollution Health Effects in COPSAC Children
Appendix B
Influenza Epidemics Variable
Influenza Epidemics is often an important confounder in time series studies of air pollution effects on respiratory disease (hospital admissions, deaths, etc.). Influenza epidemics variable used in this study was
defined as a percentage of physician visits due to influenza over total of physician visits in the whole Denmark. Influenza variable is described in Table B.1 and Figure B.1. Influenza was not a significant
confounder in our study.
Table B.1: Influenza Epidemic
| |
Study Period (02.08.1998-29.06.2003)
n = 1.793 |
| Mean SD |
n |
Median |
Range |
| Influenza Epidemics (%) |
1.4 ± 1.7 |
1.566 |
1.0 |
0 - 9.5 |
Figure b.1: Influenza epidemics as a percentage of total physician visits during the study period (02.08.1998 – 29.06.2003)
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Version 1.0 Maj 2005, © Danish Environmental Protection Agency
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