Table 4.

Odds ratio of PAD by number of clinical risk factors according to age, gender, and race/ethnicity, NHANES 1999–2002.

		Number of risk factors
	N	0	1	2	≥3	p for trend
Overall Population	4705	Ref	1.5 (0.9–2.6)	3.7 (2.3–6.1)	10.2 (6.4–16.3)	<0.01
Age <60 years	2350	Ref	1.0 (0.5–2.0)	1.6 (0.7–3.4)	4.4 (1.8–10.6)	<0.01
≥60 years	2355	Ref	1.6 (0.6–4.3)	3.5 (1.6–7.7)	7.9 (3.8–16.1)	<0.01
Male	2403	Ref	0.8 (0.4–1.8)	2.1 (1.1–3.9)	5.8 (3.7–9.3)	<0.01
Female	2302	Ref	2.8 (1.1–7.0)	6.9 (3.2–14.8)	18.6 (7.1–48.7)	<0.01
Non-Hispanic White	2510	Ref	1.2 (0.6–2.3)	3.4 (1.9–6.0)	9.4 (5.6–15.9)	<0.01
Non-Hispanic Black	822	Ref	4.9 (0.6–39.0)	5.5 (0.8–38.6)	14.7 (2.1–104.1)	<0.01
Mexican American	1057	Ref	1.9 (0.4–7.9)	3.1 (0.7–13.3)	9.8 (2.0–47.2)	<0.01

Odds ratios (ORs) and 95% confidence interval (CIs) of peripheral arterial disease (PAD) were estimated using an age-, gender- and race/ethnicity-adjusted model in the overall population using the number of risk factors as the main predictor. Stratified unadjusted analysis was performed to evaluate the odds of PAD among different age, gender and race/ethnicity groups.