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Table 2 Mutually Adjusted Incidence Rate Ratios (95% C.I.) for the association of the incidence of asthma with the main baseline characteristics (1991/1992).

From: Incidence of asthma and mortality in a cohort of young adults: a 7-year prospective study

 

Relative risk (IRR)

95% C.I.

p-value

Sex

   

Men

1

  

Women

2.32

1.16–4.67

0.017

Birth cohort *

   

1946–1951

1

  

1951–1956

1.12

0.36–3.49

0.84

1956–1961

1.69

0.60–4.77

0.32

1961–1976

1.68

0.60–4.69

0.32

1966–1971

2.28

0.82–6.34

0.11

Urban area

   

Suburban area

1

  

Urban area

2.52

0.77–8.19

0.12

Asthma-like symptoms**

   

No

1

  

Yes

4.17

2.20–7.87

<0.001

Allergic rhinitis

   

No

1

  

Yes

3.30

1.71–6.36

<0.001

Smoking habits

   

Non smokers

1

  

Ex-smokers

0.49

0.15–1.65

0.25

Smokers

0.33

0.15–0.73

<0.01

Social class

   

Medium /High

1

  

Low

1.65

0.77–3.52

0.20

  1. * test for trend p ≤ 0.01
  2. ** wheezing and/or nocturnal shortness of breath and/or nocturnal tightness in the chest