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Table 4 Risk factors for asthma and respiratory symptoms by multiple logistic regression analysis.

From: West Sweden Asthma Study: Prevalence trends over the last 18 years argues no recent increase in asthma

Independant variables

Dependant variables OR (95% CI)

Variables*

Categories

Physician diagnosed asthma

Attacks of shortness of breath

Any wheeze

Recurrent wheeze

Sputum production

Family history of asthma

Yes

2.61 (2.31-2.94)

2.44 (2.17-2.74)

2.01 (1.82-2.21)

2.35 (2.05-2.68)

1.67 (1.50-1.86)

Rhinitis

Yes

5.41 (4.81-6.08)

4.96 (4.44-5.53)

2.94 (2.69-3.21)

2.72 (2.39-3.09)

2.02 (1.83-2.22)

Smoking

Ex-smokers

1.34 (1.16-1.55)

1.29 (1.13-1.48)

1.39 (1.24-1.55)

1.35 (1.14-1.59)

1.23 (1.09-1.39)

 

Smokers

1.14 (0.98-1.33)

1.81 (1.58-2.07)

3.37 (3.04-3.72)

3.88 (3.36-4.47)

2.62 (2.36-2.92)

Age

31-45

0.84 (0.72-0.98)

1.07 (0.92-1.24)

1.01 (0.90-1.14)

1.28 (1.05-1.55)

0.81 (0.71-0.92)

 

46-60

0.74 (0.63-0.87)

1.06 (0.91-1.25)

1.06 (0.94-1.20)

1.71 (1.42-2.07)

0.81 (0.71-0.92)

 

61-75

0.90 (0.75-1.07)

1.32 (1.12-1.56)

1.20 (1.05-1.37)

2.21 (1.82-2.69)

1.10 (0.96-1.26)

Region

Gothenburg

0.95 (0.85-1.06)

1.04 (0.93-1.16)

1.06 (0.97-1.15)

1.12 (0.99-1.27)

1.17 (1.06-1.28)

Sex

Women

1.17 (1.05-1.32)

1.46 (1.30-1.63)

1.10 (1.01-1.20)

0.91 (0.80-1.03)

0.98 (0.89-1.07)

  1. Risks in odds ratios (OR) with 95% confidence intervals (95% CI).
  2. * As compared to no family history of asthma, no rhinitis, non-smokers, 16-30 years of age, living in West Gothia and men respectively.