. Author manuscript; available in PMC: 2014 Mar 24.

Published in final edited form as: J Vasc Surg. 2012 Jun;55(6):1662–73.e2. doi: 10.1016/j.jvs.2011.12.010

Table VIa. Adjusted Associations of WIQ speed score quartiles with total and cardiovascular disease mortality among PAD Participants. (n = 638).

	HR (95% CI)	p value	p for trend
All-cause mortality

1st quartile [≤ 17.4]	1.57 (1.00 - 2.44)	0.05	0.07
2nd quartile [17.4 – 32.6]	1.71 (1.12 - 2.60)	0.01
3rd quartile [32.6 – 54.3]	1.34 (0.88 - 2.05)	0.17
4th quartile [> 54.3]	1.0 (referent)	NA
Cardiovascular disease mortality

1st quartile [≤ 17.4]	1.61 (0.75 - 3.49)	0.23	0.33
2nd quartile [17.4 – 32.6]	1.80 (0.84 - 3.82)	0.13
3rd quartile [32.6 – 54.3]	1.50 (0.71 - 3.16)	0.30
4th quartile [> 54.3]	1.0 (referent)	NA

Adjusted for age, sex, race, body mass index, smoking status, ankle brachial index, comorbidities, physical activity, statin use and ACE inhibitor use. WIQ = Walking Impairment Questionnaire; CVD = cardiovascular disease; PAD = peripheral arterial disease; HR = hazard ratio. Pairwise p value shows statistical significance relative to the 4^th quartile.