Table 4.

Factors influencing the performance of Positron Emission Tomography (PET) in the period After PET was available (2004–2005) (n = 250)

Variable	Bivariate			Multivariate
	Odds Ratio	CI	p	Odds Ratio	CI	p
Age (in classes)
< 65 years	1		0.06	1		0.5
≥ 65 years	0.4	0.2 – 1.0		0.5	0.5 – 4.2
Sex
Female	1		0.04	1		0.1
Male	2.5	1.0 – 6		1.5	0.2 – 1.1
Referal
General practitioner	1		0.1	1		0.2
Specialist	4.7	0.6 – 35		3.7	0.5 – 29.7
Smoking history
Nonsmoker	1		< 0.01	1		0.4
Smokers or ex-smokers	3.9	1.5 – 9.7		1.6	0.5 – 4.6
Calcified Nodules
Yes	1		0.04	1		0.1
No	8.4	1.1–63		5.2	0.7 – 41.1
Spiculated Nodules
Yes	1		< 0.01	1		< 0.01
No	0.2	0.1 – 0.3		0.2	0.1 – 0.5
Mediastinal node
Yes	1		0.1	1		0.5
No	0.6	0.3 – 1.2		0.8	0.3 – 1.7

CI = Confidence Interval

Logistic regression analysis of the probability of patients undergoing PET as one of diagnostic tests