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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: J Cyst Fibros. 2011 Oct 13;11(1):34–39. doi: 10.1016/j.jcf.2011.09.005

Table 4.

Stepwise linear regression of clinical end point with predictor variables in patients aged 5-18 years

Clinical end point* Predictor variable Regression coefficient 95% Confidence interval p Value

FEV1 F508del homozygotes -0,511 -1,016 to -0,048 0,034
Pseudomonas + -0,376 -0,741 to -0,010 0,044

FVC F508 del homozygotes -0,551 -1,026 to -0,072 0,027
F508 del heterozygotes -0,584 -0,943 to−0,220 0,003

FEV1/FVC Smoking mother during Pregnancy (Cig/week) -0,385 -0,416 to -0,007 0,043
*

Expressed as percentage predicted. The following predictor variables were included: cotinine concentration, mother smoking during pregnancy (dicotoumus and cig/week), F508del groups, pseudomonas colonization, smoking father at home, father’s packet per years. To obtain predictor variables the comparisons of all variables were made using the unpaired Student’s t test, ANOVA test and Spearman’s rho correlation.