Table 4

 Adjusted rate ratio of myocardial infarction deaths

Length of exposure window (hours)Rate ratio of myocardial infarction deaths in an SPM category (μg/m3)
100–149150–199200–249250–299300–
RR 95%CIRR 95%CIRR 95%CIRR 95%CIRR 95%CI
Reference category was set to 0–99 μg/m3. The rate ratio was estimated by adjusting for temperature, hour when deaths occurred, and region. The temperature effect used in model was averaged over 24 hours before death.
11.13 (1.07 to 1.20)1.17 (1.07 to 1.28)1.18 (1.01 to 1.37)1.24 (0.97 to 1.57)1.40 (1.00 to 1.97)
21.09 (1.04 to 1.15)1.17 (1.07 to 1.27)1.10 (0.96 to 1.26)1.20 (0.97 to 1.48)1.25 (0.93 to 1.68)
31.09 (1.04 to 1.15)1.17 (1.09 to 1.27)1.10 (0.97 to 1.25)1.18 (0.97 to 1.43)1.22 (0.94 to 1.58)
41.09 (1.04 to 1.14)1.18 (1.10 to 1.27)1.09 (0.97 to 1.23)1.18 (0.99 to 1.41)1.17 (0.92 tp 1.49)
51.10 (1.05 to 1.15)1.14 (1.06 to 1.23)1.13 (1.01 to 1.26)1.13 (0.96 to 1.35)1.20 (0.96 to 1.50)
61.09 (1.04 to 1.14)1.16 (1.09 to 1.24)1.11 (1.00 to 1.24)1.09 (0.93 to 1.29)1.21 (0.98 to 1.49)
91.09 (1.04 to 1.13)1.14 (1.08 to 1.22)1.15 (1.05 to 1.26)1.14 (0.99 to 1.31)1.15 (0.96 to 1.38)
121.08 (1.04 to 1.13)1.15 (1.09 to 1.22)1.16 (1.06 to 1.26)1.12 (0.98 to 1.27)1.14 (0.97 to 1.34)
181.10 (1.05 to 1.14)1.14 (1.08 to 1.20)1.18 (1.09 to 1.27)1.17 (1.04 to 1.30)1.15 (1.00 to 1.32)
241.11 (1.06 to 1.15)1.16 (1.11 to 1.23)1.18 (1.09 to 1.26)1.19 (1.08 to 1.32)1.16 (1.03 to 1.32)
481.07 (1.03 to 1.12)1.18 (1.13 to 1.24)1.18 (1.10 to 1.25)1.18 (1.08 to 1.28)1.21 (1.10 to 1.33)