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Table 4 Effect modification of the association between lifetime home SHS exposure and respiratory symptoms a

From: A cross-sectional study of secondhand smoke exposure and respiratory symptoms in non-current smokers in the U.S. trucking industry: SHS exposure and respiratory symptoms

Stratification factors

Life-time home exposure

Chronic cough

Chronic phlegm

Any wheeze

Former smoking

OR

95% CI

p

OR

95% CI

p

OR

95% CI

p

Yes

Less than 10 years

ref

  

ref

  

ref

  

10-19 years

2.25

0.83 - 6.12

 

1.96

0.83 - 4.65

 

1.16

0.68 - 1.97

 

20-29 years

2.47

0.94 - 6.48

 

2.09

0.91 - 4.78

 

1.18

0.71 - 1.96

 

at least 30 years

1.81

0.68 - 4.82

 

2.18

0.97 - 4.93

 

1.26

0.77 - 2.07

 

No

Less than 10 years

ref

  

ref

  

ref

  

10-19 years

1.04

0.56 - 1.91

 

1.79

0.99 - 3.24

 

1.21

0.84 - 1.74

 

20-29 years

1.37

0.70 - 2.67

 

1.71

0.88 - 3.56

 

1.10

0.72 - 1.69

 

at least 30 years

1.17

0.58 - 2.35

 

1.54

0.77 - 3.10

 

1.33

0.86 - 1.69

 

Obesity (BMI ≥30 kg/m2)

          

Yes

Less than 10 years

ref

  

ref

  

ref

 

*

10-19 years

3.42

1.18 - 9.90

 

2.45

1.07 - 5.59

1.55

0.91 - 2.63

20-29 years

5.99

1.99 - 18.02

 

2.32

0.95 - 5.56

1.88

1.04 - 3.40

at least 30 years

4.78

1.61 - 14.23

 

2.84

1.21 - 6.70

2.27

1.28 - 4.03

No

Less than 10 years

ref

  

ref

 

ref

 

10-19 years

1.03

0.56 - 1.89

 

1.61

0.87 - 2.99

1.11

0.77 - 1.59

20-29 years

1.12

0.60 - 2.10

 

1.78

0.96 - 3.33

1.00

0.68 - 1.46

at least 30 years

0.77

0.39 - 1.53

 

1.49

0.77 - 2.87

1.07

0.72 - 1.58

Currently in urban area

          

Yes

Less than 10 years

ref

  

ref

  

ref

  

10-19 years

1.65

0.87 - 3.11

 

2.25

1.19 - 4.22

 

1.47

1.01 - 2.15

 

20-29 years

1.81

0.94 - 3.48

 

2.31

1.21 - 4.42

 

1.19

0.80 - 1.78

 

at least 30 years

1.35

0.69 - 2.67

 

1.94

1.01 - 3.75

 

1.47

0.99 - 2.19

 

No

Less than 10 years

ref

  

ref

  

ref

  

10-19 years

0.88

0.35 - 2.22

 

1.26

0.57 - 2.79

 

0.90

0.55 - 1.49

 

20-29 years

1.78

0.72 - 4.42

 

1.37

0.58 - 3.22

 

1.16

0.67 - 2.01

 

at least 30 years

1.47

0.58 - 3.73

 

1.99

0.85 - 4.62

 

1.13

0.64 - 1.98

 

Current SHS exposure

          

Yes

Less than 10 years

ref

  

ref

  

ref

  

10-19 years

1.39

0.77 - 2.52

 

1.75

0.99 - 3.09

 

1.43

0.97 - 2.11

 

20-29 years

1.13

0.60 - 2.14

 

1.41

0.77 - 2.58

 

1.39

0.92 - 2.10

 

at least 30 years

1.02

0.55 - 1.89

 

1.32

0.74 - 2.37

 

1.19

0.81 - 1.76

 

No

Less than 10 years

ref

  

ref

  

ref

  

10-19 years

1.53

0.52 - 4.48

 

2.86

1.00 - 8.16

 

1.01

0.63 - 1.64

 

20-29 years

5.21

1.89 - 14.42

 

3.94

1.37 - 11.33

 

0.88

0.51 - 1.50

 

at least 30 years

2.84

0.87 - 9.24

 

5.38

1.69 - 17.15

 

1.31

0.71 - 2.40

 
  1. a Logistic regression model adjusted for age, sex, race, job title, former smoking, pack-years, years since quitting, BMI, region of country, and urban residence except the stratification factor for each model among never smokers or former smokers who quit at least 10 years before completing the questionnaire.
  2. * p for interaction < 0.05.
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BMC Public Health

ISSN: 1471-2458

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