Abstract
Diffuse interstitial lung diseases (ILD) can have a significant impact on the health of affected patients. Questionnaires that adequately assess their health-related quality of life (HRQoL) are therefore essential. The King's Brief Interstitial Lung Disease (K-BILD) health status questionnaire is a specifically validated questionnaire to evaluate HRQoL in patients with diffuse ILD. Since it was only available in English, a study was conducted following the recommended methodology to develop a Spanish version of the questionnaire.