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Table 5 Single and multi-air pollutant models

From: Low level air pollution and exacerbation of existing copd: a case crossover analysis

Model

Without adjustment

With adjustmentb

OR (95 % CI)a

-2 log likelihood

OR (95 % CI)a

-2 log likelihood

Single Pollutant Models

 1. NO2

1.17

1.09

-

1.25

451

1.06

0.98

-

1.16

360

 2. SO2

2.78

2.08

-

3.70

413

2.28

1.64

-

3.19

336

 3. PM2.5

0.93

0.88

-

0.99

467

0.94

0.88

-

1.01

359

Multi-Pollutant Models

 4. NO2

1.04

0.96

-

1.12

412

0.96

0.88

-

1.06

335

  SO2

2.58

1.87

-

3.55

 

2.43

1.69

-

3.50

 

 5. NO2

1.31

1.21

-

1.43

423

1.17

1.05

-

1.30

351

  PM2.5

0.81

0.74

-

0.88

 

0.87

0.79

-

0.96

 

 6. SO2

2.99

2.22

-

4.02

403

2.45

1.75

-

3.45

329

  PM2.5

0.90

0.84

-

0.96

 

0.91

0.85

-

0.98

 

 7. NO2

1.16

1.05

-

1.27

393

1.04

0.93

-

1.17

329

  SO2

2.37

1.71

-

3.28

 

2.33

1.62

-

3.37

 

  PM2.5

0.84

0.77

-

0.91

 

0.89

0.81

-

0.98

 
  1. aOdds Ratios (OR) represent a one unit increase in pollutant concentration (ppb or ug/m3)
  2. bAdjusted for temperature (categorical representation based on cut-offs from RCS) and self-reported respiratory infection
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Environmental Health

ISSN: 1476-069X