Effect of meteorological variables on the incidence of respiratory tract infections

Objective: The possible effect of the various meteorological variables on the incidence of upper and lower respiratory tract infections (RTIs) has intrigued the scientific community for decades. Methods: We performed a retrospective analysis regarding the association between meteorological variables and clinical data for upper and lower RTIs in the area of Attica, Greece. Results: There was a statistically significant (P < 0.001) negative correlation between weekly average temperature with the proportion of weekly house call visits resulting in a diagnosis of upper or tower RTIs 4 days later (R= - 0.56 and - 0.71 for upper and lower RTIs, respectively) as welt as 7 days later (R= - 0.57 and - 0.71 for upper and lower RTIs, respectively) and during the same day (R= - 0.55 and - 0.68 for upper and tower RTIs, respectively). In addition, there was a negative correlation between weekly wind chill average (and minimum) temperature as well as a positive correlation of relative humidity with upper and tower RTIs. In contrast, there was no significant correlation between wind speed and upper or tower RTIs. Conclusions: The findings suggest that house call visits due to upper and lower RTIs increased as the average temperature in the area of Attica decreased. (c) 2007 Elsevier Ltd. All rights reserved.