Table 2.

Risk factors associated with incident idiopathic pulmonary fibrosis among male Veterans

	Broad Case Definition IPF: n = 129,598 Non-IPF: n = 9,767,864		Narrow Case Definition IPF: n = 76,779 Non-IPF: n = 9,767,864
	Odds Ratio (95% CI)	P Value	Odds Ratio (95% CI)	P Value
Age
⩽60 yr	(Reference)		(Reference)
>60–70 yr	2.83 (2.78–2.89)	<0.001	3.11 (3.04–3.19)	<0.001
>70–80 yr	4.39 (4.30–4.47)	<0.001	4.77 (4.65–4.89)	<0.001
>80 yr	3.21 (3.15–3.28)	<0.001	2.86 (2.78–2.94)	<0.001
Race
White	(Reference)		(Reference)
Black or African American	0.90 (0.88–0.91)	<0.001	0.93 (0.90–0.95)	<0.001
Asian/Native Hawaiian or Pacific Islander/American Indian	0.86 (0.82–0.90)	<0.001	0.86 (0.81–0.91)	<0.001
Ethnicity
Hispanic or Latino	(Reference)		(Reference)
Not Hispanic or Latino	0.99 (0.96–1.02)	0.44	0.94 (0.90–0.97)	0.001
Tobacco Use	2.94 (2.89–2.98)	<0.001	4.02 (3.93–4.11)	<0.001
Rural Residence	1.26 (1.25–1.28)	<0.001	1.21 (1.19–1.23)	<0.001

Definition of abbreviations: CI = confidence interval; IPF = idiopathic pulmonary fibrosis.