Long-term exposure to air pollution and hospital admissions for ischemic stroke. A register-based case-control study using modelled NO x as exposure proxy

Table 3 Odds ratios (ORs) and confidence intervals (CIs) for ischemic stroke risk in relation to residential modelled outdoor annual mean concentration of NO_X.

^{Partly adjusted first- and second-phase estimates, fully adjusted second-phase estimates and two-phase estimates: The two-phase estimates were calculated according to formula 1.}
^a Adjusted for birth year category, sex, birth country and marital status.
^b Adjusted for ^a and for geographical area.
^c Adjusted for ^a, ^b and for smoking, diabetes and medication for hypertension.
^d The partly adjusted first-phase OR for an increase of 10 μg/m³ in NO_x was OR^1;Partl_adj= 0.99 (0.95–1.02), p for trend = 0.44.
^e The partly adjusted second-phase OR for an increase of 10 μg/m³ in NO_x was OR^2;Partly_adj= 1.09 (0.95–1.26), p for trend p = 0.21.
^f The fully adjusted second-phase OR for an increase of 10 μg/m³ in NO_x was OR^2;Fully_adjj= 1.07 (0.93–1.24), p = 0.33
^g The two-phase OR for an increase of 10 μg/m³ in NO_x was OR¹⁺² = 0.97.
^h The widths of the two-phase CIs are likely slightly overestimated, due to dependence between the three combined estimates that we did not take into account.
ⁱMedian level of NO_x in the category 30–<60 μg/m³ is 33.0 μg/m³ (10^th–90^th percentile: 30.4–40.5)

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