Table 3.

Subgroup analysis of operation time for laparoscopic cholecystectomy

Subgroup	3D minutes; IqR (N)	2D minutes; IqR (N)	p value
Surgeon status
Attendings	42.5; 35.0–53.0 (66)	42.0; 33.3–50.0 (64)	0.406
Residents	62.0; 49.0–79.0(39)	60.0; 47.0–84.0 (40)	0.596
Sex*
Male resident	54.0; 44.0–81.0 (25)	60.0; 45.8–84.0 (30)	0.375
Female resident	69.0; 51.5–75.5 (14)	66.5; 48.8–91.3 (10)	1.00
Stereovision*
Stereopsis 10	52.0; 49.0–73.0 (15)	50.0; 43.5–64.5 (17)	0.602
Stereopsis ≤ 9	68.0; 45.5–82.0 (24)	74.0; 52.0–95.0 (23)	0.209
3D experience
≤ 50	50.0; 39.0–67.8 (72)	50.0; 40.3–67.3 (72)	0.867
> 50	47.0; 37.0–55.0 (33)	45.0; 35.3–50.8 (32)	0.412
LCC experience
≤ 200	53.5; 42.0–72.5 (48)	60.0; 45.5–84.0 (41)	0.120
> 200	44.0; 36.5–55.0 (57)	42.0; 34.0–50.0 (63)	0.167
Patient BMI
≤ 25	42.5; 36.0–52.5 (24)	43.0; 33.0–52.0 (31)	0.845
25–30	50.0; 38.5–66.8 (42)	47.0; 40.0–60.5 (40)	0.590
> 30	50.0; 47.0–72.0 (39)	55.0; 46.5–74.0 (33)	0.354

2D two-dimensional, 3D three-dimensional, BMI body mass index, IqR interquartile range, LCC laparoscopic cholecystectomy

*Residents