Table 3.

Operative factors

Factor	No. (%) of patients*			p value
	All n = 150	Grade I cholecystitis n = 104	Grade II and III cholecystitis n = 46
Time from admission to operation, h, median (IQR)*	27.0 (14.0–56.8)	27.5 (11.8–58.5)	26 (18–52.5)	0.78
Treated at an ACS hospital	19.5 (9.8–33.0)	19.0 (9.8–34.0)	19.5 (10.0–36.0)	0.68
Treated at a non-ACS hospital	55.5 (35.5–70.3)	49.0 (33.0–71.0)	58.0 (40.0–69.5)	0.77
p value	< 0.001	< 0.001	< 0.001
Operative length, min, median (IQR)†	85.5 (64.3–110.0)	78.0 (60.0–107.0)	98.0 (80.0–123.5)	0.005
Surgical approach‡				0.46
Laparoscopic	141 (94.0)	99 (95.2)	42 (91.3)
Converted	9 (6.0)	5 (4.8)	4 (8.7)
Open	0 (0)	0 (0)	0 (0)
Intraoperative cholangiography‡	17 (11.3)	13 (12.5)	4 (8.7)	0.59

ACS = acute care surgery; IQR = interquartile range.

^*Unless indicated otherwise.

^†Mann–Whitney U test.

^‡Fisher exact test.