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Table 5 Indicators differentiating occasional or daily users of residential wood heating from non-users: multivariate analysis corrected for stratified sampling

From: Use of residential wood heating in a context of climate change: a population survey in Québec (Canada)

Variables

OR1

CI95% 1

P value2

c index3

Rank

Model1

   

0.8176

14

Sociodemographic characteristics

     

Income before tax, from all sources (last 12 months):

  

0.0056

  

• < $45,000

reference group

   

• ≥ $45,000

1.1

0.9;1.5

   

• not disclosed

0.6

0.4 ; 0.9

   

First language learned at home:

  

0.0257

  

• French only

reference group

   

• English only

0.3

0.1 ; 0.7

   

• other language in addition to French or English

1.0

0.4 ; 2.8

   

• languages other than French and English

0.6

0.3 ; 1.6

   

Dwelling

     

Type of dwelling:

  

< 0.0001

  

• apartment

reference group

   

• house

10.8

6.7 ; 17.4

   

Perceived efficiency of the dwelling's insulation against heat:

  

0.0009

  

• very good

reference group

   

• good

0.7

0.5 ; 0.9

   

• average

0,6

0,4 ; 0.8

   

• poor

0.3

0.1 ; 0.6

   

Dwelling built before 19831:

  

0.0159

  

• yes

reference group

   

• no

3.1

1.4 ; 6.7

   

• unknown

1.0

0.8 ; 1.3

   

Region of residence

     

Region lived in:

  

< 0.0001

  

• Eastern Québec

reference group

   

• Northern part of southern Québec

1.2

0.7 ; 2.1

   

• Central Québec

1.0

0.6 ; 1.7

   

• Québec City region

0.7

0.4 ; 1.1

   

• North of Montréal

0.7

0.5 ; 1.1

   

• South of Montréal

0.7

0.5 ; 1.1

   

• Montréal and Laval

0.2

0.1 ; 0.4

   

Consultation of smog warning in the media

  

0.0112

  

• always

reference group

   

• often

0.9

0.6 ; 1.4

   

• sometimes

1.2

0.8 ; 1.7

   

• rarely

1.4

0.9 ; 2.1

   

• never

0.8

0.5 ; 1.1

   

Beliefs

     

Belief of the contribution of anthropogenic causes to climate change in the last fifty years:

  

0.0388

  

• a lot

reference group

   

• average

0.8

0.6 ; 1.1

   

• not much

1.0

0.7 ; 1.5

   

• not at all

0.5

0.3 ; 0.9

   

Prohibition of wood heating when there is winter smog:

  

< 0.0001

  

• completely agree

reference group

   

• somewhat agree

1.8

1.3 ; 2.6

   

• somewhat disagree

2.6

1.9 ; 3.6

   

• completely disagree

5.2

3.6 ; 7.5

   

Model2

   

0.8029

645

Type of dwelling:

  

< 0.0001

  

• apartment

reference group

   

• house

10.0

6.2 ; 16.2

   

Region lived in:

  

< 0.0001

  

• Eastern Québec

reference group

   

• Northern part of southern Québec

1.1

0.7 ; 1.9

   

• Central Québec

1.0

0.6 ; 1.7

   

• Québec City region

0.7

0.4 ; 1.1

   

• North of Montréal

0.7

0.4 ; 1.0

   

• South of Montréal

0.7

0.4 ; 1.0

   

• Montréal and Laval

0.2

0.1 ; 0.3

   

Prohibition of wood heating when there is winter smog:

  

< 0.0001

  

• completely agree

reference group

   

• somewhat agree

1.8

1.3 ; 2.6

   

• somewhat disagree

2.5

1.8 ; 3.4

   

• completely disagree

4.4

3.1 ; 6.2

   
  1. 1OR: odds ratio; IC95%: 95% confidence interval
  2. 2p value associated with the Wald test by means of logistic regression.
  3. 3Area under the ROC curve; between 0.8 and 0.9: good model. No collinearity between the independent variables was observed.
  4. 464 models had a c index over 0.8. This model ranked first.
  5. 564 models had a c index over 0.8. This model ranked last.
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BMC Public Health

ISSN: 1471-2458

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