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Table 2 The associations of chronic exposure to air pollutants and asthma severity stratified by age at asthma onset of 12 years

From: Age of asthma onset and vulnerability to ambient air pollution: an observational population-based study of adults from Southern Taiwan

 

All

Onset age > 12 years

Onset age ≤ 12 years

 

(n = 645)

(n = 413)

(n = 232)

Severity score

aOR

95 % CI

aOR

95 % CI

aOR

95 % CI

P for interaction

PM10 > 66.0 μg/m3

1.37

0.93 – 2.00

1.74

1.13 – 2.70

0.87

0.49 – 1.55

0.03

NO2 > 18.5 ppb

1.15

0.77 – 1.72

1.29

0.81 – 2.04

0.92

0.49 – 1.71

0.28

SO2 > 4.5 ppb

1.30

0.86 – 1.95

1.52

0.95 – 2.43

1.00

0.54 – 1.83

0.19

CO > 0.61 ppm

1.13

0.75 – 1.69

1.21

0.76 – 1.92

1.03

0.56 – 1.90

0.54

  1. aOR adjusted odds ratio; BMI body mass index; CI confidence interval
  2. The odds ratios were adjusted with age, sex, BMI, education level and family income level. Those exposed to the pollutant concentrations lower than medians were used as reference groups. Numbers did not total 703 because of missing data. P values were for interaction terms between “air pollutant level by median” and “age at onset by 12 years”
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BMC Pulmonary Medicine

ISSN: 1471-2466

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