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Fig. 2 | Environmental Health

Fig. 2

From: Impact of short-term exposure to air pollution on natural mortality and vulnerable populations: a multi-city case-crossover analysis in Belgium

Fig. 2

Percentage changes for all-causes mortality associated with air pollutants increase by subgroups of population BC: black carbon; CVD: cardiovascular diseases; COPD: chronic obstructive pulmonary diseases Red: significant effect modification (p<0.05); Dashed red: suggestion of effect modification (p between 0.05 and 0.20) [25]. P-values for effect modification were assessed by Z-tests, which examined the statistical significance of the effect differences between different subgroups; for variables containing more than two categories, p was calculated by comparing the estimate of the specified category with the first category [26] Percentage changes were assessed on different lag days: lag 0 for O3, lag 7 for PM2.5, PM10, NO2 and BC

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Environmental Health

ISSN: 1476-069X