“…The implementation of short instruments to measure health status has significantly improved their usage in daily clinical practice. [14][15][16][17][18][19][20][21][22][23][24] However, the currently available health status questionnaires have a number of differences in the concepts included, and various items are unique in some questionnaires. 25,26 The theoretical model of factors that potentially have an influence on health status includes factors such as age, gender, disease severity, lung function, body mass index (BMI), smoking status, symptoms, exercise capacity, co-morbidity, depression, anxiety, and exacerbations.…”