Table 4.

Adjusted associations of collateral vessel size and collateral vessel number with clinical characteristics in men and women with peripheral artery disease (n = 302)

	Collateral grade (size) (1–4 scale, 4 = largest)				p-trend value	Collateral vessel category (number) (1–3 scale, 3 = greatest number of collateral vessels)			p-trend value
	Grade = 1	Grade = 2	Grade = 3	Grade = 4		Category 1 (0–3 collateral vessels)	Category 2 (4–7 collateral vessels)	Category 3 (≥ 8 collateral vessels)
na	133	51	25	92		65	152	85
Ankle–brachial index	0.75b	0.65	0.62	0.59	< 0.001	0.79b	0.67b	0.60	< 0.001
Normalized mean plaque area	0.63b	0.69b	0.82	0.79	< 0.001	0.64b	0.70	0.74	< 0.001
Mean percent lumen area	0.38b	0.33b	0.26	0.25	< 0.001	0.38b	0.33b	0.28	< 0.001
Leg symptoms
Intermittent claudication (%)	17.6	35.7	39.9	30.1	0.038	14.9	28.7	30.3	0.077
No pain (%)	20.7	10.3	10.9	9.2	0.017	20.0	16.0	8.3	0.007

Adjusted for age, sex, race, diabetes mellitus, smoking, BMI, hypertension

^aOne participant who met criteria for a Grade = 0 was excluded from the analyses on Grade and one participant without data on smoking was excluded from the adjusted analyses in Table 4.

^bAnalyses of plaque area and lumen area were additionally adjusted for ABI. Pairwise p-value < 0.01.