Skip to main content

Table 4 Determinants of agreement between asthma defined from administrative data and self-report of ever having asthma diagnosed by a physician (n = 1638)a

From: Ascertaining asthma status in epidemiologic studies: a comparison between administrative health data and self-report

Characteristics

No agreement

n = 219

(column %)

Agreement

n = 1419

(column %)

Univariable modelsb

OR (95% CI)

Multivariable initial modelb

OR (95% CI)

Multivariable final modelb

OR (95% CI)

Sex

  

P = 0.289

  

 Males

38.4

44.4

Ref

  

 Females

61.6

55.6

0.78 (0.50–1.23)

  

Language

  

P = 0.046

P = 0.266

 

 French

87.8

94.0

Ref

Ref

 

 English

12.2

6.0

0.46 (0.21–0.98)

0.62 (0.26–1.45)

 

Parental birthplace

  

P = 0.023

P = 0.495

 

 In Quebec

87.6

89.0

Ref

Ref

 

 Outside Quebec

5.7

5.2

0.49 (0.23–1.05)

0.72 (0.29–1.76)

 

 In and outside Quebec

6.7

5.8

0.60 (0.23–1.54)

0.62 (0.23–1.64)

 

Area of residence 1987-2011c

 

P = 0.120

P = 0.417

 

 All urban

62.6

58.9

Ref

Ref

 

 All rural

65.8

11.0

1.99 (0.81–4.94)

1.71 (0.65–4.51)

 

 Urban and rural

31.5

30.1

1.00 (0.62–1.62)

0.89 (0.53–1.50)

 

Family income 1991, 2011d

P = 0.776

  

 Quartile 1, on average

8.3

9.3

Ref

  

 Quartile 2, on average

29.4

29.3

0.89 (0.37–2.13)

  

 Quartile 3, on average

41.1

37.4

0.82 (0.35–1.91)

  

 Quartile 4, on average

21.1

23.9

1.03 (0.42–2.56)

  

Material deprivation index 1987-2011e

 

P = 0.757

  

 1, most privileged

9.6

10.2

Ref

  

 2

28.9

25.3

0.72 (0.26–1.92)

  

 3

27.0

32.0

0.89 (0.35–2.30)

  

 4

27.6

26.3

0.79 (0.30–2.08)

  

 5, most deprived

6.9

6.1

0.74 (0.21–2.62)

  

Social deprivation index 1987-2011e

 

P = 0.801

  

 1, most privileged

7.1

9.6

Ref

  

 2

32.2

33.4

0.84 (0.36–1.94)

  

 3

27.7

29.5

0.86 (0.37–1.98)

  

 4

28.1

23.2

0.73 (0.31–1.72)

  

 5, most deprived

4.8

4.3

0.70 (0.20–2.42)

  

Maternal education level

  

P = 0.436

  

 Elementary school

27.0

30.8

Ref

  

 Secondary school

46.0

39.4

0.75 (0.41–1.40)

  

 College

12.0

15.0

1.02 (0.45–2.33)

  

 University

15.0

14.9

0.83 (0.38–1.81)

  

Paternal education level

  

P = 0.117

P = 0.353

 

 Elementary school

40.8

34.2

Ref

Ref

 

 Secondary school

23.1

33.6

1.54 (0.86–2.76)

1.47 (0.77–2.81)

 

 College

8.9

10.7

1.36 (0.57–3.27)

1.32 (0.51–3.43)

 

 University

27.2

21.4

0.92 (0.50–1.72)

0.92 (0.46–1.83)

 

Parental history of asthma

 

P = 0.079

P = 0.222

P = 0.1982

 No

76.5

84.2

Ref

Ref

Ref

 Yes

23.5

15.8

0.61 (0.35–1.06)

0.68 (0.37–1.26)

0.67 (0.37–1.23)

Number of health services for allergic diseasesf

P = 0.0001

P = 0.0003

P = 0.0002

 0

32.4

45.0

Ref

Ref

Ref

 ≥ 1

67.6

55.0

0.40 (0.25–0.63)

0.42 (0.26–0.67)

0.41 (0.25–0.65)

  1. a Asthma from administrative health data was defined as having ≥ 2 asthma-related physician claims over 30 years or ≥ 1 asthma-related hospitalization, within a 30-year lookback window (1983–2012)
  2. b On imputed dataset and applying weights corresponding to the inverse of the sampling probability and correcting variance estimates with the Taylor series method
  3. c Determined using the second character of subjects’ residential postal codes (0: rural, ≠ 0: urban) in 1987, 1991 and 2011
  4. d Estimated by ‘median family income’ from the 1991 and 2011 Canadian census using the 1st three characters of subjects’ residential postal code. The summarized value consists in the average quartile of income over these two times
  5. e Estimated by the material and social deprivation indices based on the subjects’ residential postal codes in 1987, 1991 and 2011. The summarized value consists in the average index over these three times, rounded up to the next integer
  6. f Allergic diseases include allergic rhinitis, eczema, allergic urticaria, and other allergies non-specified; asthma is excluded
  7. Compilation based on data from the ©Government of Quebec, Institut de la statistique du Québec, Survey on Childhood Environment and the Development of Allergic Diseases, 2012 and Quebec Birth Cohort on Immunity and Health, 2017. Institut de la statistique du Québec is not responsible for compilations or interpretation of results
Back to article page

BMC Medical Research Methodology

ISSN: 1471-2288

Contact us