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Table 2 Second-phase descriptive data for the variables diabetes, smoking, medication for hypertension.

From: Long-term exposure to air pollution and hospital admissions for ischemic stroke. A register-based case-control study using modelled NOxas exposure proxy

   Cases Controls ORb 95% CI Controls, stratified by modelled residential outdoor NOx-levela
   N (%) N(%)    ≤20 μg/m3 NOX
N (%)
>20 μg/m3
NOX
N (%)
Smoking Yes 1139 (26) 629 (13) 2.8 2.5–3.2 457 (12) 172 (17)
  No 3236 (74) 4087 (87) 1   3250 (88) 837 (83)
Diabetes Yes 934 (21) 501 (11) 2.1 1.8–2.4 388 (10) 113 (11)
  No 3441 (79) 4215 (89) 1   3319 (90) 896 (89)
Medication for hypertension Yes 1974 (45) 1482(31) 1.7 1.5–1.8 1161 (31) 321 (32)
  No 2401(55) 3234 (31) 1   2546 (69) 688 (68)
Total   4375 4716     
  1. aThe residential outdoor annual means of NOX, modelled with a GIS and an emission database. The year for the annual mean is selected by distributing the controls over time with the same distribution as the date of diagnosis for the cases
  2. b Crude odds ratio for ischemic stroke.