Table 2.

Multivariable Cox regression prediction model of lung cancer risk in the training set.

Variables		β coefficient	SE	HRa (95% CI)	χ2 (df)	P value
Age (years)
	40-44	N/Ab	N/A	1.00	N/A	N/A
	45-49	–0.19	0.59	0.83 (0.26-2.64)	0.10 (1)	.75
	50-54	–0.06	0.62	0.94 (0.28-3.19)	0.01 (1)	.93
	55-59	0.30	0.65	1.34 (0.38-4.80)	0.21 (1)	.65
	60-64	0.85	0.64	2.33 (0.67-8.11)	1.78 (1)	.18
	65-69	0.88	0.64	2.41 (0.69-8.49)	1.89 (1)	.17
	70-74	0.58	0.72	1.79 (0.43-7.40)	0.65 (1)	.42
History of chronic respiratory disease
	No	N/A	N/A	1.00	N/A	N/A
	Yes	0.66	0.23	1.94 (1.24-3.04)	8.45 (1)	.004 c
First-degree family history of lung cancer
	No	N/A	N/A	1.00	N/A	N/A
	Yes	0.47	0.29	1.60 (0.91-2.83)	2.63 (1)	.11
Menopause
	No	N/A	N/A	1.00	N/A	N/A
	Yes	0.77	0.45	2.16 (0.90-5.19)	2.95 (1)	.09
History of benign breast disease
	No	N/A	N/A	1.00	N/A	N/A
	Yes	–0.55	0.25	0.58 (0.36-0.94)	4.97 (1)	.03

^aHR: hazard ratio.

^bN/A: not applicable.

^cItalicized values indicate statistical significance.