Study on Disease Progression and Nutritional Status in Bronchiectasis

Bronchiectasis is a common lung disease. The Bronchiectasis Severity Index (BSI) is a widely used assessment system. The body mass index (BMI) is a commonly used measure of nutritional status, but it has its limitations. To provide a more comprehensive assessment, the investigators also consider other nutrition-related indices such as upper arm circumference, calf circumference, skinfold thickness and grip strength. The investigators will specify the relationship between nutritional status and disease progression by measuring nutrition-related indicators and tracking participants' disease progression.