Abstract
RESULTS: A total of 315,400 records were analyzed (Table). Average age was 51.4 ( 19.9) years; 65.1% were female. Conversion to open surgery occurred in 0.3% (n1⁄41,023) of cases. Riskadjusted odds of conversion increased by 14% (95% CI 1.131.15) for each day that surgery was delayed. Risk-adjusted costs per patient were 122% higher (absolute difference $47,800) for patients who underwent conversion (relative 101% increase [absolute difference $41,100] when restricted to acute cholecystitis cases).
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