. Author manuscript; available in PMC: 2012 Jun 21.

Published in final edited form as: J Pediatr. 2005 May;146(5):675–680. doi: 10.1016/j.jpeds.2004.12.020

Table II.

Logistic regression analysis using clinical features as independent variables and the presence of two CFTR mutations versus zero CFTR mutations as the dependent variable

	All entered		Alternate model: three entered
Independent variable	β	P value	β	P value
Absence of the vas deferens	2.94	0.01	2.85	.01
Steatorrhea	−1.62	0.03	−1.64	.02
P aeruginosa positive culture	0.97	0.11	1.11	.04
Age at diagnosis	0.02	0.44
Average sweat Cl⁻	0.01	0.61
Nasal polyps	−0.92	0.13
Abnormal chest x-ray/CT	0.35	0.51
Model χ²	25.9		22.60
P value	P = .001		P <.001
R²	0.243		0.216
% Correct prediction	71.0		68.8