Prevention

Why?

• Complications are more likely when incidental procedures are performed ^a or the surgery is more risky ^b

Incidental procedures and more risky surgery increases the risk of complications

Patient	Prognostic Factor	Outcome	CER	OR (95% CI)	NNF+ (95% CI)
cholecystectomy a	incidental procedure independent	any complication at ?30 days	30%	2.0 (1.22 to 3.29)	6 (4 to 23)
elective surgery b	increased surgical risk independent	any complication at 30 days	30%	1.76 (1.09 to 2.89)	7 (4 to 52)