Table 5 Multivariable logistic model predicting malignancy.

Variable	Odds ratio	95% CI	p value
Age (per 10 years)	1.06	0.77 to 1.45	0.7
Pack years	1.21	1.05 to 1.38	0.007
Primary stage 3 or 4	1.57	0.74 to 3.33	0.2
Size of nodule (cm)	1.07	1.03 to 1.12	0.001
Primary metastasises to lungs	0.77	0.33 to 1.79	0.5
Months elapsed from diagnosis of primary	1.00	0.99 to 1.01	0.8
Patient on active treatment	1.52	0.66 to 3.51	0.3
Multifocal nodules	0.82	0.36 to 1.86	0.6