The King's Brief Interstitial Lung Disease (KBILD) questionnaire: An updated minimal clinically important difference

Aish Sinha; Amit Suresh Patel; Richard J. Siegert; Sabrina Bajwah; Toby M. Maher; Elizabeth A. Renzoni; Athol U. Wells; Irene J. Higginson; Surinder S. Birring

doi:10.1136/bmjresp-2018-000363

The King's Brief Interstitial Lung Disease (KBILD) questionnaire: An updated minimal clinically important difference

Aish Sinha, Amit Suresh Patel, Richard J. Siegert, Sabrina Bajwah, Toby M. Maher, Elizabeth A. Renzoni, Athol U. Wells, Irene J. Higginson, Surinder S. Birring^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

Introduction The King's Brief Interstitial Lung Disease (KBILD) is a 15-item validated health-related quality of life (HRQOL) questionnaire. The method of scoring the KBILD has recently changed to incorporate a logit-scale transformation from one that used raw item responses, as this is potentially a more linear scale. The aim of this study was to re-evaluate the KBILD minimal clinically important difference (MCID) using the new logit -transformed scoring. Methods 57 patients with interstitial lung disease (17 idiopathic pulmonary fibrosis, IPF) were asked to complete the KBILD questionnaire on two occasions in outpatient clinics. At the second visit, patients also completed a 15-item global rating of change of health status questionnaire (GRCQ). The MCID was calculated as the mean of four different methods: The change in KBILD for patients indicating a small change in GRCQ, patients with a 7%-12% change in FVC, 1 SE of measurement of baseline KBILD and effect size (ES) of 0.3. Results The mean (SD) KBILD total score for all patients was 55.3 (15.6). 16 patients underwent a therapeutic intervention. 36 patients reported a change in their condition on the GRCQ; 22 deteriorated, 14 improved and 21 were unchanged. There was a significant change in KBILD total score in patients reporting a change in GRCQ; mean (SD) 57.0 (13.6) versus 50.0 (9.7); mean difference 7.0; 95% CI of difference 3.0 to 11.0; p<0.01. The change in KBILD total score correlated with the GRCQ scale; r=-0.49, p<0.01. The mean KBILD total score MCID was 5. The MCID of KBILD domains were 6 for Psychological, 7 for Breathlessness and Activities, and 11 for Chest Symptoms. Conclusion The KBILD is a responsive tool for longitudinal assessment of HRQOL in patients with ILD. The MCID of the KBILD total score is a 5-unit change.

Original language	English
Article number	e000363
Journal	BMJ Open Respiratory Research
Volume	6
Issue number	1
DOIs	https://doi.org/10.1136/bmjresp-2018-000363
Publication status	Published - 1 Feb 2019

Keywords

global rating of change questionnaire
health related quality of life
interstitial lung disease
king's brief Interstitial lung disease questionnaire
minimal clinically important difference

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10.1136/bmjresp-2018-000363

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@article{eac4977cfc1f44499df2d8c2c83a0422,

title = "The King's Brief Interstitial Lung Disease (KBILD) questionnaire: An updated minimal clinically important difference",

abstract = "Introduction The King's Brief Interstitial Lung Disease (KBILD) is a 15-item validated health-related quality of life (HRQOL) questionnaire. The method of scoring the KBILD has recently changed to incorporate a logit-scale transformation from one that used raw item responses, as this is potentially a more linear scale. The aim of this study was to re-evaluate the KBILD minimal clinically important difference (MCID) using the new logit -transformed scoring. Methods 57 patients with interstitial lung disease (17 idiopathic pulmonary fibrosis, IPF) were asked to complete the KBILD questionnaire on two occasions in outpatient clinics. At the second visit, patients also completed a 15-item global rating of change of health status questionnaire (GRCQ). The MCID was calculated as the mean of four different methods: The change in KBILD for patients indicating a small change in GRCQ, patients with a 7%-12% change in FVC, 1 SE of measurement of baseline KBILD and effect size (ES) of 0.3. Results The mean (SD) KBILD total score for all patients was 55.3 (15.6). 16 patients underwent a therapeutic intervention. 36 patients reported a change in their condition on the GRCQ; 22 deteriorated, 14 improved and 21 were unchanged. There was a significant change in KBILD total score in patients reporting a change in GRCQ; mean (SD) 57.0 (13.6) versus 50.0 (9.7); mean difference 7.0; 95% CI of difference 3.0 to 11.0; p<0.01. The change in KBILD total score correlated with the GRCQ scale; r=-0.49, p<0.01. The mean KBILD total score MCID was 5. The MCID of KBILD domains were 6 for Psychological, 7 for Breathlessness and Activities, and 11 for Chest Symptoms. Conclusion The KBILD is a responsive tool for longitudinal assessment of HRQOL in patients with ILD. The MCID of the KBILD total score is a 5-unit change.",

keywords = "global rating of change questionnaire, health related quality of life, interstitial lung disease, king's brief Interstitial lung disease questionnaire, minimal clinically important difference",

author = "Aish Sinha and Patel, {Amit Suresh} and Siegert, {Richard J.} and Sabrina Bajwah and Maher, {Toby M.} and Renzoni, {Elizabeth A.} and Wells, {Athol U.} and Higginson, {Irene J.} and Birring, {Surinder S.}",

year = "2019",

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doi = "10.1136/bmjresp-2018-000363",

language = "English",

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T1 - The King's Brief Interstitial Lung Disease (KBILD) questionnaire

T2 - An updated minimal clinically important difference

AU - Sinha, Aish

AU - Patel, Amit Suresh

AU - Siegert, Richard J.

AU - Bajwah, Sabrina

AU - Maher, Toby M.

AU - Renzoni, Elizabeth A.

AU - Wells, Athol U.

AU - Higginson, Irene J.

AU - Birring, Surinder S.

PY - 2019/2/1

Y1 - 2019/2/1

N2 - Introduction The King's Brief Interstitial Lung Disease (KBILD) is a 15-item validated health-related quality of life (HRQOL) questionnaire. The method of scoring the KBILD has recently changed to incorporate a logit-scale transformation from one that used raw item responses, as this is potentially a more linear scale. The aim of this study was to re-evaluate the KBILD minimal clinically important difference (MCID) using the new logit -transformed scoring. Methods 57 patients with interstitial lung disease (17 idiopathic pulmonary fibrosis, IPF) were asked to complete the KBILD questionnaire on two occasions in outpatient clinics. At the second visit, patients also completed a 15-item global rating of change of health status questionnaire (GRCQ). The MCID was calculated as the mean of four different methods: The change in KBILD for patients indicating a small change in GRCQ, patients with a 7%-12% change in FVC, 1 SE of measurement of baseline KBILD and effect size (ES) of 0.3. Results The mean (SD) KBILD total score for all patients was 55.3 (15.6). 16 patients underwent a therapeutic intervention. 36 patients reported a change in their condition on the GRCQ; 22 deteriorated, 14 improved and 21 were unchanged. There was a significant change in KBILD total score in patients reporting a change in GRCQ; mean (SD) 57.0 (13.6) versus 50.0 (9.7); mean difference 7.0; 95% CI of difference 3.0 to 11.0; p<0.01. The change in KBILD total score correlated with the GRCQ scale; r=-0.49, p<0.01. The mean KBILD total score MCID was 5. The MCID of KBILD domains were 6 for Psychological, 7 for Breathlessness and Activities, and 11 for Chest Symptoms. Conclusion The KBILD is a responsive tool for longitudinal assessment of HRQOL in patients with ILD. The MCID of the KBILD total score is a 5-unit change.

AB - Introduction The King's Brief Interstitial Lung Disease (KBILD) is a 15-item validated health-related quality of life (HRQOL) questionnaire. The method of scoring the KBILD has recently changed to incorporate a logit-scale transformation from one that used raw item responses, as this is potentially a more linear scale. The aim of this study was to re-evaluate the KBILD minimal clinically important difference (MCID) using the new logit -transformed scoring. Methods 57 patients with interstitial lung disease (17 idiopathic pulmonary fibrosis, IPF) were asked to complete the KBILD questionnaire on two occasions in outpatient clinics. At the second visit, patients also completed a 15-item global rating of change of health status questionnaire (GRCQ). The MCID was calculated as the mean of four different methods: The change in KBILD for patients indicating a small change in GRCQ, patients with a 7%-12% change in FVC, 1 SE of measurement of baseline KBILD and effect size (ES) of 0.3. Results The mean (SD) KBILD total score for all patients was 55.3 (15.6). 16 patients underwent a therapeutic intervention. 36 patients reported a change in their condition on the GRCQ; 22 deteriorated, 14 improved and 21 were unchanged. There was a significant change in KBILD total score in patients reporting a change in GRCQ; mean (SD) 57.0 (13.6) versus 50.0 (9.7); mean difference 7.0; 95% CI of difference 3.0 to 11.0; p<0.01. The change in KBILD total score correlated with the GRCQ scale; r=-0.49, p<0.01. The mean KBILD total score MCID was 5. The MCID of KBILD domains were 6 for Psychological, 7 for Breathlessness and Activities, and 11 for Chest Symptoms. Conclusion The KBILD is a responsive tool for longitudinal assessment of HRQOL in patients with ILD. The MCID of the KBILD total score is a 5-unit change.

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ER -

The King's Brief Interstitial Lung Disease (KBILD) questionnaire: An updated minimal clinically important difference

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