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Table 2 a Logistic regression predicting an exercise-induced desaturation of ≥ 4% and SpO2 of < 90% during the 6-min walking test. b Sensitivity analysis predicting an exercise-induced desaturation of ≥ 4% and SpO2 of < 90% during the 6 min walking test

From: Association of air pollution exposure with exercise-induced oxygen desaturation in COPD

a

Variable

Crude OR (95% CI)

p value

Adjusted OR (95% CI)*

p value

PM10(μg/m3)

1.258 (1.080–1.466)

0.003

1.288 (1.099–1.509)

0.002

PM2.5(μg/m3)

1.424 (1.135–1.787)

0.002

1.476 (1.166–1.869)

0.001

NO2(ppb)

1.514(1.184–1.935)

0.001

1.584 (1.223–2.053)

 < 0.001

O3(ppb)

0.838 (0.583–1.204)

0.339

0.812 (0.558–1.182)

0.276

b

Variables

Adjust OR# (95%CI)

P value

Adjust ORÂ¥ (95%CI)

P value

PM10(μg/m3)

1.306 (1.108–1.539)

0.001

1.313 (1.096–1.574)

0.003

PM2.5(μg/m3)

1.502 (1.178–1.917)

0.001

1.471 (1.138–1.903)

0.003

NO2(ppb)

1.654 (1.257–2.177)

 < 0.001

1.800 (1.308–2.476)

 < 0.001

O3(ppb)

0.812 (0.554–1.189)

0.283

0.664 (0.405–1.090)

0.105

  1. PM10 particulate matter of < 10 μm in aerodynamic diameter, PM2.5 particulate matter of < 2.5 μm in aerodynamic diameter, NO2 nitrogen dioxide, O3 ozone, OR odds ratio, CI confidence interval
  2. *Multivariable logistic regression adjusted for age, sex, smoking pack-year
  3. #Multivariable logistic regression adjusted for age, sex, smoking pack-year and seasonal effects
  4. ¥Multivariable logistic regression adjusted for age, sex, smoking pack-year, seasonal effects and AE frequency