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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