Table 4.

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

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)

Risks in odds ratios (OR) with 95% confidence intervals (95% CI).

* As compared to no family history of asthma, no rhinitis, non-smokers, 16-30 years of age, living in West Gothia and men respectively.