Table 4.

Asthma prevalence determinants : Effects of age, sex, municipality population density, and geographical location (latitude and longitude) on asthma prevalence in Sweden in multivariate logistic regression analysis.

	Odds ratio	95%CI	Wald's chi-square	p
Municipality population density*)	1.02	1.02-1.02	1720.6	< 0.0001
Age, years	1.39	1.33–1.44	271.3	< 0.0001
Age squared	0.94	0.94–0.95	456.7	< 0.0001
Male sex	1.19	1.16–1.23	159.7	< 0.0001
Latitude, degree North	1.07	1.06–1.09	147.3	< 0.0001
Longitude, degree East	0.97	0.96–0.98	30.7	< 0.0001

*⁾ Number of residents, divided by 100, per square kilometre municipality area.