Table 1.

Effect of operator grade and presence or absence of acute cholecystitis on duration of operation (minutes).

	Surgeon		Resident
	# of Cases	Operating Time (min ± SEM)	# of Cases	Operating Time (min ± SEM)
Elective	124	97 ± 42	74	119 ± 33a
Acute cholecystitis	38	111 ± 54b	15	145 ± 50c

Statistical comparison of duration of operation was performed by chi-squared test. a vs c and b vs c both significantly different, p < 0.05.