Translation and validation of the walking impairment questionnaire in Brazilian subjects with intermittent claudication.
BACKGROUND
The Walking Impairment Questionnaire (WIQ) has been used to evaluate walking impairment in subjects with intermittent claudication (IC). However, this questionnaire has yet to be translated to Brazilian Portuguese, which limits its use in Brazilian subjects.


OBJECTIVE
To translate and analyze the validity and reliability of WIQ in Brazilian subjects with IC.


METHODS
Forty-two patients with IC, determined by the ankle-brachial index < 0.90, participated in the study. After translation and re-translation, carried out by two independent translators, the construct validity of the WIQ was analyzed by correlating the WIQ scores with the Medical Outcome Study Questionnaire Short Form 36 (SF-36) scores and the physical fitness performance (treadmill and strength tests). The reliability was analyzed with a 7-day interval between two questionnaire applications.


RESULTS
Significant correlations between the WIQ domains and the SF-36 (functional capacity, physical aspects, bodily pain and emotional aspects) and physical fitness performance (treadmill and strength tests) were observed. Moreover, the intraclass coefficient correlation ranged from 0.72 to 0.81, and there were no differences in WIQ scores between the two questionnaire applications.


CONCLUSIONS
The Brazilian Portuguese version of the WIQ is valid and reliable to be used in Brazilian subjects with IC.
Faculdade de Saúde Pública, USP, São Paulo, SP, Brazil. rdias@usp.br
Raphael Mendes
RM
Ritti-Dias
Luis Alberto
LA
Gobbo
Gabriel Grizzo
GG
Cucato
Nelson
N
Wolosker
Wilson
W
Jacob Filho
José Maria
JM
Santarém
Celso Ricardo Fernandes
CR
Carvalho
Cláudia Lúcia de Moraes
CL
Forjaz
Maria de Fátima Nunes
Mde F
Marucci
D055109:Ankle Brachial Index; D001938:Brazil; D003466:Cultural Characteristics; D005260:Female; D006801:Humans; D007383:Intermittent Claudication / Q000503:physiopathology*; D007802:Language; D008297:Male; D008875:Middle Aged; D051346:Mobility Limitation; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*; D014175:Translating; D016138:Walking