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CONTEXT AND OBJECTIVE: Many clinical investigations use generic and/or specific questionnaires to obtain information about participants and patients. There is disagreement about whether the administration method can affect the results. The aim here was to determine whether, among patients with intermittent claudication (IC), there are differences in the Walking Impairment Questionnaire (WIQ) and European Quality of Life-5 Dimension (EQ-5D) scores with regard to: 1) the questionnaire administration method (self-administration versus face-to-face interview); and 2) the type of interviewer (vascular surgeon, VS, versus general practitioner, GP). DESIGN AND SETTING: Cross-sectional observational multicenter epidemiological study carried out within the Spanish National Health Service. METHODS: 1,641 evaluable patients with IC firstly completed the WIQ and EQ-5D questionnaires and then were interviewed by their doctor on the same day. Pearson correlations and Chi-square tests were used. RESULTS: There was a strong correlation (r > 0.800; P < 0.001) between the two methods of administering the WIQ and EQ-5D questionnaires, and between the VS and GP groups. Likewise, there was a high level of concordance (P > 0.05) between the different dimensions of the WIQ-distance and EQ-5D (selfadministration versus face-to-face) in the VS and GP groups. CONCLUSION: There was no difference between the different methods of administering the WIQ and EQ-5D questionnaires, among the patients with IC. Similarly, the two types of interviewers (VS or GP) were equally valid. Therefore, it seems unnecessary to expend effort to administer these questionnaires by interview, in studies on IC. RESULTADOS: Houve forte correlação (r > 0,800; P < 0,001) entre os dois métodos de administração do WIQ e EQ-5D; e entre os grupos CV e MG. Também houve alto nível de concordância (P > 0,05) entre as diferentes dimensões do WIQ-distância e EQ-5D (autoadministrado versus entrevista presencial), nos grupos CV e MG. CONCLUSÃO: Em pacientes com CI, não há diferenças entre as diferentes formas de administrar os questionários WIQ e EQ-5D. Da mesma forma, os dois tipos de entrevistador (CV ou MG) foram igualmente válidos. Portanto, não parece necessário despender esforço para administrar esses questionários através de entrevista, em estudos de CI. RESUMO
CONTEXT AND OBJECTIVE: Many clinical investigations use generic and/or specific questionnaires to obtain information about participants and patients. There is disagreement about whether the administration method can affect the results. The aim here was to determine whether, among patients with intermittent claudication (IC), there are differences in the Walking Impairment Questionnaire (WIQ) and European Quality of Life-5 Dimension (EQ-5D) scores with regard to: 1) the questionnaire administration method (self-administration versus face-to-face interview); and 2) the type of interviewer (vascular surgeon, VS, versus general practitioner, GP). DESIGN AND SETTING: Cross-sectional observational multicenter epidemiological study carried out within the Spanish National Health Service. METHODS: 1,641 evaluable patients with IC firstly completed the WIQ and EQ-5D questionnaires and then were interviewed by their doctor on the same day. Pearson correlations and Chi-square tests were used. RESULTS: There was a strong correlation (r > 0.800; P < 0.001) between the two methods of administering the WIQ and EQ-5D questionnaires, and between the VS and GP groups. Likewise, there was a high level of concordance (P > 0.05) between the different dimensions of the WIQ-distance and EQ-5D (selfadministration versus face-to-face) in the VS and GP groups. CONCLUSION: There was no difference between the different methods of administering the WIQ and EQ-5D questionnaires, among the patients with IC. Similarly, the two types of interviewers (VS or GP) were equally valid. Therefore, it seems unnecessary to expend effort to administer these questionnaires by interview, in studies on IC. RESULTADOS: Houve forte correlação (r > 0,800; P < 0,001) entre os dois métodos de administração do WIQ e EQ-5D; e entre os grupos CV e MG. Também houve alto nível de concordância (P > 0,05) entre as diferentes dimensões do WIQ-distância e EQ-5D (autoadministrado versus entrevista presencial), nos grupos CV e MG. CONCLUSÃO: Em pacientes com CI, não há diferenças entre as diferentes formas de administrar os questionários WIQ e EQ-5D. Da mesma forma, os dois tipos de entrevistador (CV ou MG) foram igualmente válidos. Portanto, não parece necessário despender esforço para administrar esses questionários através de entrevista, em estudos de CI. RESUMO
Hemos leído con interés el excelente trabajo de García Iglesias et al. publicado «on line» en la revista de su dirección 1 , por el cual felicitamos a sus autores. Su lectura nos permite hacer unas consideraciones adicionales de nuestro estudio VITAL 2,3 , aportando datos no publicados. Nos referimos a una influencia «colateral» que tiene la presencia de los factores de riesgo cardiovascular (FRCV) en la población española afecta de claudicación intermitente.El estudio VITAL valoró 1.641 pacientes claudicantes españoles (920 en consultas de angiólogos y cirujanos vasculares, y 721 en las de médicos de atención primaria) repartidos homogéneamente por todo el estado español. Entre las conclusiones generales del citado estudio se Tabla 1 Calidad de vida de los pacientes claudicantes valorado mediante el cuestionario EQ-5D (auto-administrado al paciente) y su relación con diversos factores de riesgo cardiovascular ACV (n = 920) MAP (n = 721) Total (n = 1.641) Valor de p22 0,56 ± 0,20 0,55 ± 0,21 0,348 a Sí 0,60 ± 0,20 0,60 ± 0,19 0,60 ± 0,20 0,948 a Ex-fumador 0,60 ± 0,20 0,58 ± 0,18 0,59 ± 0,19 0,062 a Diabetes mellitus < 0,001 b No 0,62 ± 0,18 0,62 ± 0,17 0,62 ± 0,18 0,076 a Sí 0,54 ± 0,22 0,52 ± 0,19 0,54 ± 0,21 0,948 a Hipertensión arterial < 0,001 b No 0,63 ± 0,19 0,61 ± 0,20 0,62 ± 0,20 0,239 a Sí 0,57 ± 0,21 0,57 ± 0,19 0,57 ± 0,20 0,205 a Dislipemia < 0,001 b No 0,60 ± 0,22 0,60 ± 0,20 0,60 ± 0,21 0,423 a Sí 0,57 ± 0,20 0,56 ± 0,19 0,57 ± 0,20 0,094 a Obesidad < 0,001 b No 0,60 ± 0,20 0,55 ± 0,20 0,58 ± 0,20 0,056 a Sí 0,53 ± 0,21 0,55 ± 0,21 0,54 ± 0,21 0,784 a Sedentarismo < 0,001 a No 0,65 ± 0,17 0,65 ± 0,15 0,65 ± 0,16 0,460 a Sí 0,53 ± 0,22 0,54 ± 0,21 0,54 ± 0,21 0,846 a N. • de factores mayores c < 0,001 b 0 (ninguno) 0,66 ± 0,16 0,63 ± 0,20 0,64 ± 0,18 0,364 a 1 (solo uno) 0,63 ± 0,19 0,62 ± 0,18 0,63 ± 0,19 0,288 a 2 (dos) 0,60 ± 0,20 0,58 ± 0,20 0,59 ± 0,20 0,037 a 3 (tres) 0,53 ± 0,21 0,55 ± 0,19 0,54 ± 0,20 0,720 a 4 (todos) 0,57 ± 0,20 0,53 ± 0,19 0,56 ± 0,19 0,256 a Global 0,58 ± 0,21 0,57 ± 0,20 0,57 ± 0,21 0,429 a ACV: angiólogos y cirujanos vasculares; MAP:médicos de atención primaria. Nota: 0 (peor); 1 (mejor posible) calidad de vida. a Comparar entre los 2 tipos de investigador (ACV o MAP). b Comparar entre las categorías de variables (valores totales). c Fumador, diabetes mellitus, hipertensión arterial y dislipemia.expone que estos pacientes refieren una merma para la capacidad de marcha (medida mediante el cuestionario Walking Impairment Questionnaire [WIQ]) y una pobre calidad de vida relacionada con la salud (CVRS), calculada mediante el Cuestionario Europeo de Calidad de Vida-5 Dimensiones (EQ-5D). Pues bien, estos 2 paramentos (distancia-WIQ y CVRS) están influenciados significativamente según la presencia/ausencia de los FRCV más importantes (tabaco, diabetes mellitus, hipertensión arterial, dislipemia, obesidad o sedentarismo) y del número de los mismos. La tabla 1 pone de manifiesto como la presencia de un determinado FRCV reduce la CVRS, respecto de los claudicantes sin ese facto...
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