Ann Surg Treat Res.  2017 Aug;93(2):103-109. 10.4174/astr.2017.93.2.103.

Validation of the Korean version of the walking impairment questionnaire in patients with peripheral arterial disease

• Choi C
• Lee T
• Min SK
• Han A
• Kim SY
• Min SI
• Ha J
• Jung IM

• KMID: 2387341
• DOI: http://doi.org/10.4174/astr.2017.93.2.103

Abstract

PURPOSE
Intermittent claudication is the most common early symptom of peripheral arterial occlusive disease. Walking impairment questionnaire (WIQ) is a short, inexpensive, easy-to-complete questionnaire to assess intermittent claudication and can provide data of usual walking. The purpose of this study is to validate the new Korean version of WIQ.
METHODS
Total 51 patients with claudication were enrolled. While 4 patients were dropped out, 47 patients with claudication into were divided groups based on the treatment received: surgery (n = 33) and medication (n = 14). The surgery group was subdivided into the bypass (n = 13) and intervention (n = 20) groups. WIQ score, ankle-brachial index (ABI), and treadmill test scores were assessed initially and after 12 weeks.
RESULTS
The WIQ scores were significantly correlated with ABI and pain-free walking distance (PFWD) and maximum walking distance (MWD) in all groups (except for MWD in the intervention group). Speed and stair-climb scores (2 WIQ domains) were well correlated with ABI, PFWD, and MWD. Distance scores were mostly correlated with ABI, PFWD, and MWD in all groups except ABI in the bypass and intervention groups and MWD in the bypass group. Reproducibility was observed in all groups (intraclass correlation coefficient > 0.8).
CONCLUSION
The Korean version of the WIQ is valid and reproducible, and can be effectively used to assess Korean patients with intermittent claudication.

Keyword

Korea; Walking; Surveys and questionnaires; Peripheral arterial disease; Intermittent claudication

MeSH Terms

Ankle Brachial Index
Arterial Occlusive Diseases
Exercise Test
Humans
Intermittent Claudication
Korea
Peripheral Arterial Disease*
Surveys and Questionnaires
Walking*

Figure

• 

  Fig. 1 Study flowchart for testing for validity and reproducibility. ABI, ankle-brachial index; WIQ, walking impairment questionnaire.

• 

  Fig. 2 Consort diagram. The enrolled subjects were assigned to the surgery and medication groups; the surgery group was further subdivided into the bypass and intervention groups.

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  Fig. 3 Correlation analysis between the objective indices and walking impairment questionnaire scores. a)Pearson correlation efficient (r) and P-value. b)The surgery group included the bypass and intervention groups. ABI, ankle-brachial index; PFWD, pain-free walking distance; MWD, maximum walking distance.

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