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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.