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.
Ritti-Dias
Raphael Mendes
RM
Faculdade de Saúde Pública, USP, São Paulo, SP, Brazil. rdias@usp.br
Gobbo
Luis Alberto
LA
Cucato
Gabriel Grizzo
GG
Wolosker
Nelson
N
Jacob Filho
Wilson
W
Santarém
José Maria
JM
Carvalho
Celso Ricardo Fernandes
CR
Forjaz
Cláudia Lúcia de Moraes
CL
Marucci
Maria de Fátima Nunes
Mde F
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