Original Articles
Internal Consistency and Validity of the Spanish Version of the St. George' Respiratory Questionnaire for Use in Patients With Clinically Stable Bronchiectasis
M.A. Martínez Garcíaa,
, M. Perpiñá Torderab, P. Román Sánchezc, Soler Cataluñaa
Corresponding author
med013413@nacom.es
Correspondence: Dr. M.A. Martínez García. Unidad de Neumología. Servicio de Medicina Interna. Hospital General de Requena. Pasaje Casablanca, s/n. 46230 Requena. Valencia. España
Correspondence: Dr. M.A. Martínez García. Unidad de Neumología. Servicio de Medicina Interna. Hospital General de Requena. Pasaje Casablanca, s/n. 46230 Requena. Valencia. España
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Román Sánchez, Soler Cataluña" "autores" => array:4 [ 0 => array:5 [ "preGrado" => "Dr." "nombre" => "M.A." "apellidos" => "Martínez García" "email" => array:1 [ 0 => "med013413@nacom.es" ] "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff1" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">*</span>" "identificador" => "cor1" ] ] ] 1 => array:3 [ "nombre" => "M." "apellidos" => "Perpiñá Tordera" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff2" ] ] ] 2 => array:3 [ "nombre" => "P." "apellidos" => "Román Sánchez" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">c</span>" "identificador" => "aff3" ] ] ] 3 => array:3 [ "nombre" => "Soler" "apellidos" => "Cataluña" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff1" ] ] ] ] "afiliaciones" => array:3 [ 0 => array:3 [ "entidad" => "Unidad de Neumología, Servicio de Medicina Interna, Hospital General de Requena, Requena, Valencia, Spain" "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff1" ] 1 => array:3 [ "entidad" => "Servicio de Neumología, Hospital Universitario La Fe, Valencia, Spain" "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff2" ] 2 => array:3 [ "entidad" => "Servicio de Medicina Interna, Hospital General de Requena, Requena, Valencia, Spain" "etiqueta" => "<span class="elsevierStyleSup">c</span>" "identificador" => "aff3" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor1" "etiqueta" => "*" "correspondencia" => "Correspondence: Dr. M.A. Martínez García. Unidad de Neumología. Servicio de Medicina Interna. Hospital General de Requena. Pasaje Casablanca, s/n. 46230 Requena. Valencia. España" ] ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2004-03-18" "fechaAceptado" => "2004-06-04" "PalabrasClave" => array:2 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Key Words" "identificador" => "xpalclavsec153966" "palabras" => array:4 [ 0 => "Health-related quality of life" 1 => "Bronchiectasis" 2 => "St. George's Questionnaire" 3 => "Internal consistency. Validity" ] ] ] "es" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Palabras clave" "identificador" => "xpalclavsec153967" "palabras" => array:5 [ 0 => "Calidad de vida relacionada con la salud" 1 => "Bronquiectasias" 2 => "Cuestionario St. George's" 3 => "Consistencia interna" 4 => "Validez" ] ] ] ] "tieneResumen" => true "resumen" => array:2 [ "en" => array:1 [ "resumen" => "<span class="elsevierStyleSectionTitle">Objective</span><p class="elsevierStyleSimplePara elsevierViewall">To analyze the reliability and validity of the St. George's Respiratory Questionnaire (SGRQ) for use in patients with clinically stable bronchiectasis.</p> <span class="elsevierStyleSectionTitle">Material and Methods</span><p class="elsevierStyleSimplePara elsevierViewall">The SGRQ (50 items on 3 scales—symptoms, activity, and impact) was administered to 102 patients (mean [SD] age, 69.5 [8.7] years; 63% men) with clinically stable bronchiectasis. Disease severity was classified according parameters such as airflow obstruction (forced expiratory volume in 1 second), colonization by <span class="elsevierStyleItalic">Pseudomonas aeruginosa</span>, extent of bronchiectasis, symptoms, daily quantity of sputum, and number of exacerbations. Internal consistency (Cronbach's alpha and correlation between items and between item and scale), concurrent validity (correlation between items and clinical variables), predictive validity (correlation between items and severity), and construct validity (factorial analysis of main components) were assessed.</p> <span class="elsevierStyleSectionTitle">Results</span><p class="elsevierStyleSimplePara elsevierViewall">The internal consistency of the SGRQ was excellent (Cronbach's alpha between 0.81 and 0.87 for the different scales, and 0.90 for the overall score). Concurrent validity was high, as correlations between items and clinical variables were significant and followed the expected distribution. The SGRQ differentiated between degrees of disease severity, regardless of the clinical variable used. The factorial analysis showed a construct of 4 factors that were only moderately similar to the original structure of the questionnaire, due mainly to inclusion of a small number of questions with conditioned response and others with low discriminatory capacity.</p> <span class="elsevierStyleSectionTitle">Conclusions</span><p class="elsevierStyleSimplePara elsevierViewall">The SGRQ shows excellent concurrent and predictive internal consistency and validity, though restructuring of the original construct would be advisable before use in patients with stable bronchiectasis.</p>" ] "es" => array:1 [ "resumen" => "<span class="elsevierStyleSectionTitle">Objetivo</span><p class="elsevierStyleSimplePara elsevierViewall">Analizar la fiabilidad y validez del St. George's Respiratory Questionnaire (SGRQ) para su uso en pacientes afectados de bronquiectasias estables.</p> <span class="elsevierStyleSectionTitle">Material y Métodos</span><p class="elsevierStyleSimplePara elsevierViewall">El SGRQ (50 ítems en 3 escalas: síntomas, actividad e impacto) se administró a 102 pacientes (edad media ± desviación estándar de 69,5 ± 8,7 años; 63% varones) con bronquiectasias clínicamente estables. Se clasificó la gravedad según diferentes parámetros: obstrucción al flujo respiratorio (volumen espiratorio forzado en el primer segundo), colonización por <span class="elsevierStyleItalic">Pseudomonas aeruginosa</span>, extensión de las bronquiectasias, síntomas, cantidad de esputo diario y número de agudizaciones. Se calcularon la consistencia interna (alfa de Cronbach y correlación ítem-ítem e ítems-escala), la validez concurrente (correlación ítems-variables medidas), la validez predictiva (correlación ítems-parámetros de gravedad) y la validez de constructo (análisis factorial de componentes principales).</p> <span class="elsevierStyleSectionTitle">Resultados</span><p class="elsevierStyleSimplePara elsevierViewall">La consistencia interna del SGRQ fue excelente (alfa de Cronbach entre 0,81 y 0,87 para las distintas escalas, y 0,90 para la puntuación total). La validez concurrente fue elevada, ya que las correlaciones ítems-variables medidas fueron significativas y se distribuyeron de la forma prevista. El SGRQ permitió diferenciar adecuadamente los distintos grados de gravedad de la enfermedad independien-temente de los parámetros utilizados. El análisis factorial mostró un constructo de 4 factores que se asemejaba tan solo de forma moderada a la estructura original del cuestionario, sobre todo por la inclusión de preguntas con bajo porcentaje de respuestas obligadas y otras con bajo poder discriminatorio.</p> <span class="elsevierStyleSectionTitle">Conclusiones</span><p class="elsevierStyleSimplePara elsevierViewall">El SGRQ presenta una excelente consistencia interna y validez tanto concurrente como predictiva, si bien sería recomendable una reestructuración previa del constructo original para su uso en pacientes con bronquiectasias estables.</p>" ] ] "NotaPie" => array:1 [ 0 => array:1 [ "nota" => "<p class="elsevierStyleNotepara">Work subsidized in part by the grant RedRespira-ISCiii-TRIC-03/11.</p>" ] ] "bibliografia" => array:2 [ "titulo" => "REFERENCES" "seccion" => array:1 [ 0 => array:1 [ "bibliografiaReferencia" => array:24 [ 0 => array:3 [ "identificador" => "bib1" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Bronchiectasis" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "AF Barker" ] ] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1056/NEJMra012519" "Revista" => array:6 [ "tituloSerie" => "N Engl J Med." 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| Year/Month | Html | Total | |
|---|---|---|---|
| 2024 November | 3 | 0 | 3 |
| 2024 October | 27 | 23 | 50 |
| 2024 September | 25 | 19 | 44 |
| 2024 August | 59 | 45 | 104 |
| 2024 July | 23 | 24 | 47 |
| 2024 June | 40 | 30 | 70 |
| 2024 May | 40 | 34 | 74 |
| 2024 April | 16 | 29 | 45 |
| 2024 March | 20 | 17 | 37 |
| 2024 February | 34 | 16 | 50 |
| 2023 March | 3 | 2 | 5 |
| 2023 February | 18 | 19 | 37 |
| 2023 January | 17 | 29 | 46 |
| 2022 December | 17 | 31 | 48 |
| 2022 November | 18 | 40 | 58 |
| 2022 October | 21 | 52 | 73 |
| 2022 September | 15 | 29 | 44 |
| 2022 August | 20 | 42 | 62 |
| 2022 July | 23 | 49 | 72 |
| 2022 June | 13 | 38 | 51 |
| 2022 May | 21 | 53 | 74 |
| 2022 April | 19 | 29 | 48 |
| 2022 March | 18 | 38 | 56 |
| 2022 February | 16 | 20 | 36 |
| 2022 January | 17 | 34 | 51 |
| 2021 December | 18 | 43 | 61 |
| 2021 November | 23 | 37 | 60 |
| 2021 October | 67 | 36 | 103 |
| 2021 September | 20 | 39 | 59 |
| 2021 August | 19 | 32 | 51 |
| 2021 July | 19 | 27 | 46 |
| 2021 June | 19 | 34 | 53 |
| 2021 May | 17 | 30 | 47 |
| 2021 April | 47 | 49 | 96 |
| 2021 March | 33 | 16 | 49 |
| 2021 February | 25 | 24 | 49 |
| 2021 January | 23 | 15 | 38 |
| 2020 December | 15 | 11 | 26 |
| 2020 November | 26 | 12 | 38 |
| 2020 October | 42 | 9 | 51 |
| 2020 September | 28 | 9 | 37 |
| 2020 August | 52 | 10 | 62 |
| 2020 July | 86 | 17 | 103 |
| 2020 June | 12 | 9 | 21 |
| 2020 May | 43 | 21 | 64 |
| 2020 April | 38 | 18 | 56 |
| 2020 March | 42 | 21 | 63 |
| 2020 February | 27 | 20 | 47 |
| 2020 January | 17 | 15 | 32 |
| 2019 December | 35 | 12 | 47 |
| 2019 November | 10 | 10 | 20 |
| 2019 October | 9 | 9 | 18 |
| 2019 September | 13 | 17 | 30 |
| 2019 August | 6 | 6 | 12 |
| 2019 July | 7 | 17 | 24 |
| 2019 June | 11 | 7 | 18 |
| 2019 May | 19 | 17 | 36 |
| 2019 April | 32 | 25 | 57 |
| 2019 March | 12 | 18 | 30 |
| 2019 February | 4 | 11 | 15 |
| 2019 January | 2 | 10 | 12 |
| 2018 December | 4 | 12 | 16 |
| 2018 November | 13 | 17 | 30 |
| 2018 October | 20 | 15 | 35 |
| 2018 September | 8 | 14 | 22 |
| 2018 May | 2 | 0 | 2 |
| 2018 April | 5 | 8 | 13 |
| 2018 March | 10 | 1 | 11 |
| 2018 February | 2 | 6 | 8 |
| 2018 January | 10 | 10 | 20 |
| 2017 December | 5 | 7 | 12 |
| 2017 November | 5 | 5 | 10 |
| 2017 October | 4 | 9 | 13 |
| 2017 September | 4 | 5 | 9 |
| 2017 August | 6 | 8 | 14 |
| 2017 July | 2 | 6 | 8 |
| 2017 June | 8 | 10 | 18 |
| 2017 May | 6 | 11 | 17 |
| 2017 April | 2 | 1 | 3 |
| 2017 March | 4 | 3 | 7 |
| 2017 February | 1 | 5 | 6 |
| 2017 January | 2 | 4 | 6 |
| 2016 December | 12 | 5 | 17 |
| 2016 November | 14 | 6 | 20 |
| 2016 October | 23 | 10 | 33 |
| 2016 September | 10 | 5 | 15 |
| 2016 August | 6 | 3 | 9 |
| 2016 March | 1 | 0 | 1 |
| 2016 February | 1 | 0 | 1 |
| 2015 December | 2 | 0 | 2 |
| 2015 October | 38 | 1 | 39 |
| 2015 September | 27 | 18 | 45 |
| 2015 August | 23 | 14 | 37 |
| 2015 July | 34 | 8 | 42 |
| 2015 June | 26 | 10 | 36 |
| 2015 May | 42 | 14 | 56 |
| 2015 April | 24 | 20 | 44 |
| 2015 March | 27 | 10 | 37 |
| 2015 February | 27 | 7 | 34 |
| 2015 January | 33 | 10 | 43 |
| 2014 December | 19 | 6 | 25 |
| 2014 November | 26 | 10 | 36 |
| 2014 October | 34 | 10 | 44 |
| 2014 September | 31 | 7 | 38 |
| 2014 August | 41 | 10 | 51 |
| 2014 July | 34 | 6 | 40 |
| 2014 June | 48 | 8 | 56 |
| 2014 May | 40 | 11 | 51 |
| 2014 April | 48 | 4 | 52 |
| 2014 March | 58 | 9 | 67 |
| 2014 February | 49 | 9 | 58 |
| 2014 January | 34 | 8 | 42 |
| 2013 December | 39 | 7 | 46 |
| 2013 November | 43 | 8 | 51 |
| 2013 October | 51 | 4 | 55 |
| 2013 September | 41 | 11 | 52 |
| 2013 August | 35 | 6 | 41 |
| 2013 July | 48 | 9 | 57 |
| 2013 June | 33 | 9 | 42 |
| 2013 May | 34 | 6 | 40 |
| 2013 April | 23 | 7 | 30 |
| 2013 March | 9 | 2 | 11 |
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