Electronic Thesis and Dissertation Repository


Master of Science


Epidemiology and Biostatistics


Malthaner, Richard

2nd Supervisor

Welk, Blayne

3rd Supervisor

Choi, Yun-Hee


Introduction: There is no differentiation between primary spontaneous pneumothorax (PSP) and secondary pneumothorax (SP) in the current version of the International Classification of Diseases (ICD-10). Objective: To validate the accuracy of an algorithm that identifies cases of PSP from administrative databases. Methods: The charts of 150 patients who attended the emergency room (ER) with a recorded main diagnosis of pneumothorax were reviewed. The corresponding hospital administrative data collected during previous hospitalizations and ER visits were processed through the proposed algorithm. The results were compared over two different age groups. Results: The results obtained from the PSP algorithm demonstrated a significantly higher sensitivity (97% vs. 81%, p=0.038) and positive predictive value (87% vs. 46%, p

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