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Results of stepwise multiple correlation analysis. Dependent variable: Annual physician contacts due to bronchitis, Independent variables in the beginning: Age; Sex; Highest school education of parents; Smoking at home; Medium traffic immission; High traffic immission. N: 68, Multiple R: 0.583

Results of stepwise multiple correlation analysis. Dependent variable:
Annual physician contacts due to bronchitis, Independent variables in the beginning: Age; Sex; Highest school education of parents; Smoking at home; Medium traffic immission; High traffic
immission. N: 68, Multiple R: 0.583