Total size corresponds to 4166 observations. The discrepancy with the total size indicated in the "material and methods" section is due to missing data.
Figures in bold print correspond to the 432 situations with ozone concentrations higher than 110 μg/m3/8h and temperatures below 26°C. Underlined figures correspond to the 164 situations with temperatures above 26°C and ozone concentrations below 110 μg/m3/8h. Figures in italics correspond to the 265 situations with ozone concentrations above 110 μg/m3/8h and temperatures above 26°C.