Table 3 Association between exposure to air pollutants and hospitalization with UGIB secondary to PUD among patients residing in Calgary (n = 1374) and Edmonton (n = 1149)

1.14 (0.94–1.38)

0.92 (0.73–1.15)

0.94 (0.81–1.08)

0.95 (0.84–1.07)

0.92 (0.81–1.05)

1.01 (0.93–1.09)

0.85 (0.70–1.02)

1.02 (0.81–1.29)

1.01 (0.88–1.17)

1.05 (0.93–1.19)

0.93 (0.81–1.06)

0.95 (0.87–1.04)

0.95 (0.73–1.23)

0.88 (0.63–1.23)

0.92 (0.75–1.13)

0.96 (0.81–1.14)

0.85 (0.72–1.00)

0.94 (0.84–1.05)

1.07 (0.78–1.47)

0.87 (0.59–1.28)

0.68 (0.53–0.88)

0.82 (0.67–1.01)

0.75 (0.61–0.90)

0.87 (0.75–1.00)

1.06 (0.74–1.52)

0.90 (0.58–1.39)

0.67 (0.51–0.89)

0.85 (0.68–1.06)

0.78 (0.63–0.97)

0.88 (0.75–1.03)

0.99 (0.79–1.24)

1.01 (0.85–1.20)

1.11 (0.90–1.36)

1.05 (0.90–1.22)

1.01 (0.90–1.14)

0.97 (0.84–1.13)

0.94 (0.75–1.17)

0.97 (0.80–1.17)

1.05 (0.86–1.28)

1.02 (0.88–1.19)

0.98 (0.86–1.11)

0.87 (0.74–1.01)

0.95 (0.72–1.27)

0.99 (0.76–1.29)

1.02 (0.79–1.33)

1.02 (0.83–1.24)

0.94 (0.80–1.10)

0.83 (0.68–1.00)

1.06 (0.77–1.46)

0.91 (0.66–1.26)

0.88 (0.65–1.18)

0.94 (0.74–1.18)

0.88 (0.73–1.06)

0.79 (0.64–0.99)

1.06 (0.75–1.50)

0.89 (0.61–1.29)

0.82 (0.58–1.15)

0.90 (0.69–1.17)

0.86 (0.70–1.06)

0.79 (0.61–1.01)