Translation and Validation of the King's Brief Interstitial Lung Disease Questionnaire in Hindi Language.

The King's Brief Interstitial Lung Disease (K-BILD) questionnaire, used to evaluate health-related quality of life (HRQoL) in interstitial lung diseases (ILDs), has been translated and validated in multiple languages. However, there is currently no validated Hindi translation available. This study aimed to translate and validate the K-BILD questionnaire into Hindi for ILD patients. Using a forward-backward translation method after approval from the original developers, we created the Hindi version and provided it to patients alongside the St George's Respiratory Questionnaire (SGRQ). We evaluated the Hindi K-BILD's reliability and validity by examining internal consistency, concurrent validity, and effect size (ES). About 86 patients completed the Hindi version of the K-BILD questionnaire, demonstrating good internal consistency in the total score, breathlessness and activities, and psychological domains (Cronbach's α = 0.939, 0.916, and 0.928, respectively) and acceptable consistency in the chest symptoms domain (Cronbach's α = 0.732). Concurrent validity with the SGRQ domains and total scores was strong to very strong (p < 0.001). The K-BILD score also distinguished disease severity, notably in forced vital capacity (FVC) Z score (0.257) and diffusion capacity of lung for carbon monoxide (DLCO) Z score (0.181). The Hindi language-translated K-BILD questionnaire was well accepted by patients and showed excellent validity, comparable to the original version of K-BILD in English language. The validated Hindi K-BILD enhances patient care, communication, and research for Hindi-speaking ILD patients by providing a reliable, culturally relevant tool for assessing health status and disease severity.