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BACKGROUND Despite the widespread use of sputum weight to assess the effect of airway clearance interventions, its psychometric properties have not been evaluated. The purpose of this ad hoc analysis was to determine the test-retest reliability of 24-h sputum weight in clinically stable individuals with bronchiectasis. This study also aimed to estimate the minimum important difference of 24-h sputum weight after an airway clearance session in subjects with bronchiectasis. METHODS Sixty subjects were included in the 24-h test-retest cohort, 42 of who