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Table 3 Associations between subsequent exposure to ambient air pollutants and preschool asthma in acute bronchiolitis infants. (n=2637)

From: Air pollution after acute bronchiolitis is a risk factor for preschool asthma: a nested case-control study

Major air pollutions (per IQR)

OR

95%CI

p-value

aORa

95%CI

p-value

0-3 months

 SO2 (ppb)

1.978

1.730-2.262

<.0001

1.977

1.728-2.261

<.0001

 PM2.5 (μg/m3)

2.512

2.149-2.936

<.0001

2.510

2.148-2.935

<.0001

 PM10 (μg/m3)

1.518

1.354-1.701

<.0001

1.517

1.354-1.700

<.0001

 NO (ppb)

1.922

1.653-2.235

<.0001

1.919

1.651-2.232

<.0001

 NO2 (ppb)

1.625

1.405-1.880

<.0001

1.623

1.403-1.877

<.0001

 NOx(ppb)

1.754

1.510-2.038

<.0001

1.752

1.508-2.035

<.0001

0-6 months

 SO2 (ppb)

1.971

1.725-2.253

<.0001

1.970

1.724-2.252

<.0001

 PM2.5 (μg/m3)

2.605

2.216-3.063

<.0001

2.603

2.214-3.061

<.0001

 PM10 (μg/m3)

1.535

1.368-1.723

<.0001

1.535

1.368-1.722

<.0001

 NO (ppb)

1.918

1.649-2.230

<.0001

1.915

1.647-2.227

<.0001

 NO2 (ppb)

1.630

1.406-1.890

<.0001

1.628

1.404-1.887

<.0001

 NOx(ppb)

1.740

1.500-2.020

<.0001

1.738

1.497-2.017

<.0001

0-12 months

 SO2 (ppb)

2.042

1.779-2.343

<.0001

2.040

1.777-2.342

<.0001

 PM2.5 (μg/m3)

2.538

2.172-2.966

<.0001

2.538

2.172-2.965

<.0001

 PM10 (μg/m3)

1.559

1.394-1.743

<.0001

1.559

1.394-1.744

<.0001

 NO (ppb)

1.952

1.676-2.275

<.0001

1.950

1.673-2.272

<.0001

 NO2 (ppb)

1.645

1.422-1.903

<.0001

1.643

1.420-1.901

<.0001

 NOx(ppb)

1.771

1.525-2.058

<.0001

1.769

1.523-2.056

<.0001

  1. ORs (95% Cis) were estimated for per IQR increase in SO2, PM2.5, PM10, NO, NO2, and NOX
  2. Abbreviations: SO2: sulphur dioxide; PM2.5: particulate matters with diameters at 2.5 micrometers and smaller; PM10: particulate matters with diameters at 10 micrometers and smaller; NO: nitrogen oxide; NO2: nitrogen dioxide; NOX: nitrogen oxides; OR: crude odds ratio; aOR: adjusted odds ratio
  3. aConditional logistic regressions were conducted controlling baseline demographic characteristics age, gender, allergic rhinitis, chronic sinusitis, and atopic dermatitis
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Environmental Health

ISSN: 1476-069X