Table 5

Association (odds ratio (95% CI) for interquartile change) between nitrogen dioxide and ozone and mortality, controlling for pollen and spores

More than one admission: always asthma*
Nitrogen dioxideOzone
*Adjusted for epidemic days. Conducted in years 1985 and 1988–94 for the non-adjusted model and after including pollen; and for the years 1990–4 after including spores.
Not adjusted1.688 (1.074 to 2.652)1.755 (0.984 to 3.133)
Adjusted for:
Total pollen1.655 (1.057 to 2.621)1.736 (0.971 to 3.102)
Gramineas1.689 (1.074 to 2.655)1.758 (0.984 to 3.142)
Total spores1.599 (0.911 to 2.809)1.931 (0.975 to 3.825)
Cladosporium 1.598 (0.904 to 2.826)1.964 (0.990 to 3.896)
Alternaria 1.610 (0.916 to 2.827)1.949 (0.968 to 3.928)