Skip to main content
. 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 IVa. Adjusted Associations of WIQ stair climbing score quartiles with total and cardiovascular disease mortality among PAD Participants. (n = 638).

HR pairwise
(95% Confidence Interval) p value p for trend
All-cause mortality
1st quartile [≤ 25.0] 1.70 (1.08 – 2.66) 0.02 0.02
2nd quartile [25.0 – 41.7] 1.75 (1.13 – 2.70) 0.01
3rd quartile [41.7 – 66.7] 1.26 (0.82 – 1.91) 0.29
4th quartile [> 66.7] 1.0 (referent) NA
Cardiovascular disease mortality
1st quartile [≤ 25.0] 3.11 (1.30 – 7.47) 0.01 0.04
2nd quartile [25.0 – 41.7] 3.32 (1.43 – 7.72) 0.01
3rd quartile [41.7 – 66.7] 2.03 (0.88 – 4.71) 0.10
4th quartile [> 66.7] 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 4th quartile.