Figure 4
Single pollutant model results for all respiratory causes according to the same-day exposures, Palermo, Sicily, 2005-2007 (Air pollutants: CO and NO 2 ). Associations are expressed as adjusted odds ratio (OR) [95% confidence interval (CI)] in relation to an increase of 10 μg/m3 of selected air pollutants (CO: an increase of 1 mg/m3), according to age groups, sex, and seasons (cold season: October to March, warm season: April to September). ORs adjusted for meteo-climatic parameters, and influenza epidemic peaks (see Methods - Statistical analysis).