Variable		No Conversion		Conversion		p
Variable		n	%	n	%	p
Gender	Female	1228	97.9	26	2.1	<0.001
Gender	Male	316	90.5	30	9.5	<0.001
Age	>60	424	95.8	18	4.2	0.642
Age	<60	1130	96.6	38	3.4	0.642
Concomitant diseases	Present	548	97.1	16	2.9	0.083
Concomitant diseases	Not present	1006	96.0	40	4.0	0.083
Previous abdominal surgery	Upper abdominal surgery	20	75.0	5	25.0	<0.001
	Lower abdominal surgery	304	95.1	15	4.9
	No abdominal surgery	1230	97.1	36	2.9
Acute cholecystitis	Yes No	114	93.9	7	6.1	<0.001
Acute cholecystitis	Yes No	1430	96.6	49	3.4	<0.001
History of jaundice	Yes	37	89.2	4	10.8	<0.001
History of jaundice	No	1507	96.5	52	3.5	<0.001
Obesity	Yes No	684	94.2	40	5.8	<0.001
Obesity	Yes No	860	98.1	16	1.9	<0.001
Gall bladder wall on ultrasound	Thick	335	96.6	12	3.4	0.972
Gall bladder wall on ultrasound	Normal	1209	96.5	44	3.5	0.972
Preoperative ERCP	Yes	4	66.7	2	33.3	<0.001
Preoperative ERCP	No	1540	96.6	54	3.4	<0.001