title: Validation of a Brazilian Portuguese Version of the Walking Estimated-Limitation Calculated by History (WELCH).
abstract: BACKGROUND
  The Walking Estimated-Limitation Calculated by History (WELCH) questionnaire has been proposed to evaluate walking impairment in patients with intermittent claudication (IC), presenting satisfactory psychometric properties. However, a Brazilian Portuguese version of the questionnaire is unavailable, limiting its application in Brazilian patients.
  
  
  OBJECTIVE
  To analyze the psychometric properties of a translated Brazilian Portuguese version of the WELCH in Brazilian patients with IC.
  
  
  METHODS
  Eighty-four patients with IC participated in the study. After translation and back-translation, carried out by two independent translators, the concurrent validity of the WELCH was analyzed by correlating the questionnaire scores with the walking capacity assessed with the Gardner treadmill test. To determine the reliability of the WELCH, internal consistency and test-retest reliability with a seven-day interval between the two questionnaire applications were calculated.
  
  
  RESULTS
  There were significant correlations between the WELCH score and the claudication onset distance (r = 0.64, p = 0.01) and total walking distance (r = 0.61, p = 0.01). The internal consistency was 0.84 and the intraclass correlation coefficient between questionnaire evaluations was 0.84. There were no differences in WELCH scores between the two questionnaire applications.
  
  
  CONCLUSIONS
  The Brazilian Portuguese version of the WELCH presents adequate validity and reliability indicators, which support its application to Brazilian patients with IC.
authors.affiliation: Hospital Israelita Albert Einstein, São Paulo, SP, Brazil.
authors.forename: Gabriel Grizzo
authors.initials: GG
authors.lastname: Cucato
authors.affiliation: Escola Superior de Educação Física, Universidade de Pernambuco, Recife, PE, Brazil.
authors.forename: Marilia de Almeida
authors.initials: Mde A
authors.lastname: Correia
authors.affiliation: Escola Superior de Educação Física, Universidade de Pernambuco, Recife, PE, Brazil.
authors.forename: Breno Quintella
authors.initials: BQ
authors.lastname: Farah
authors.affiliation: Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Glauco Fernandes
authors.initials: GF
authors.lastname: Saes
authors.affiliation: Escola de Educação Física e Esporte, Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Aluísio Henrique de Andrade
authors.initials: AH
authors.lastname: Lima
authors.affiliation: Hospital Israelita Albert Einstein, São Paulo, SP, Brazil.
authors.forename: Raphael Mendes
authors.initials: RM
authors.lastname: Ritti-Dias
authors.affiliation: Hospital Israelita Albert Einstein, São Paulo, SP, Brazil.
authors.forename: Nelson
authors.initials: N
authors.lastname: Wolosker
mesh_terms: D000368:Aged; D055109:Ankle Brachial Index; D001938:Brazil; D004185:Disability Evaluation; D005080:Exercise Test / Q000379:methods; D005260:Female; D006801:Humans; D007383:Intermittent Claudication / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011594:Psychometrics; D015203:Reproducibility of Results; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires / Q000592:standards*; D014177:Translations; D016138:Walking / Q000502:physiology*