. 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 IVb. Adjusted Associations of WIQ stair climbing score quartiles with total and cardiovascular disease mortality among non-PAD Participants.

	HR	pairwise
	(95% Confidence Interval)	p value	p for trend
All-cause mortality

1st quartile [≤ 41.7]	0.70( 0.29 - 1.67)	0.42	0.94
2nd quartile [41.7 – 66.7]	0.71( 0.31 - 1.60)	0.41
3rd quartile [66.7 – 87.5]	0.43( 0.18 - 1.04)	0.06
4th quartile [> 87.5]	1.0 (referent)	NA
Cardiovascular disease mortality

1st quartile [≤ 41.7]	2.62( 0.45 - 15.21)	0.28	0.29
2nd quartile [41.7 – 66.7]	2.55( 0.49 - 13.41)	0.27
3rd quartile [66.7 – 87.5]	0.48( 0.07 - 3.36)	0.46
4th quartile [> 87.5]	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.