Table 1.

Basic characteristic of patients undergoing laparoscopic cholecystectomy and of the surgeons operating on them N (%)

	3D (n = 105)	2D (n = 104)
Age, median; IqR	48.5; 56.4–24.7	49.9; 38.2–59.3
BMI, median; IqR	28.4; 31.9–25.1	27.3; 31.0–24.7
Male patient	31 (29.5%)	27 (26.0%)
ASA-classification
1	37 (35.2%)	47 (45.2%)
2	60 (57.1%)	49 (47.1%)
3	8 (7.6%)	8 (7.7%)
Charlson's comorbidity index
0	97 (92.4%)	100 (96.2%)
1	6 (5.7%)	2 (1.9%)
2	2 (1.9%)	1 (1.0%)
3	0	1 (1.0%)
History of earlier abdominal operation(s)
Open	4 (3.8%)	3 (2.9%)
Laparoscopic	9 (8.6%)	12 (11.5%)
Indication
Symptomatic gallbladder stones	100 (95.2%)	98 (94.2%)
Earlier pancreatitis and gallbladder stones	1 (1.0%)	0
Gallbladder and bile duct stones	2 (1.9%)	0
Gallbladder polyp	2 (1.9%)	2 (1.9%)
Other	0 (1.0%)	2 (1.9%)
Earlier cholecystitis	0	2 (1.9%)
Surgeon
Man	89 (84.8%)	94 (90.4%)
Attending	66 (62.9%)	64 (61.5%)
Resident	39 (37.1%)	40 (38.5%)
Surgeon experience in LCC, cases
< 50	2 (1.9%)	4 (3.8%)
50–200	46 (43.8%)	37 (35.6%)
> 200	57 (54.3%)	63 (60.6%)
Surgeon experience in 3D laparoscopy, cases
5–10	19 (18.1%)	14 (13.5%)
10–50	53 (50.5%)	58 (55.8%)
> 50	33 (31.4%)	32 (30.8%)
Surgeon stereo acuity, stereopsis 10	74 (70.5%)	80 (76.9%)

2D two-dimensional, 3D three-dimensional, ASA The American Society of Anesthesiologists physical status classification, BMI body mass index, IqR interquartile range, LCC laparoscopic cholecystectomy