Table 4.

Variables associated with length of stay (LOS), total charge (TC), operating room time (min), and Barthel index (BI) improvement.

	LOS		TC		Operating room time		BI improvement
	Estimation	95% CI	Estimation	95% CI	Estimation	95% CI	Estimation	95% CI
Intercept	11.6	[8.2–14.9]	6937	[5925–7949]	151.5	[132.7–170.3]	37.4	[34.0–40.9]
Age (for 65–74 years)
75–84 years	2.9	[0.2–5.6]	620	[−196–1436]	1.2	[−13.1–15.4]	−6.1	[−8.8–−3.3]
85-years	1.9	[0.6–3.2]	483	[86–880]	−2.3	[−9.2–4.6]	−0.4	[−1.7–1.0]
Male	−0.1	[−1.4–1.2]	174	[−212–560]	6.0	[−0.7–12.7]	1.3	[0.0–2.6]
Ambulance	3.1	[0.8–5.5]	1487	[782–2193]	6.3	[−6.0–18.7]	3.1	[0.7–5.5]
Severity (for noinflammation)
Acute	2.5	[0.9–4.1]	1032	[544–1519]	8.2	[−0.4–16.9]	−0.3	[−2.0–1.3]
Chronic or others	3.8	[2.1–5.6]	1690	[1167–2213]	18.3	[9.0–27.7]	0.8	[−1.0–2.6]
Charlson comorbidity index (for zero)
1	7.3	[4.4–10.2]	2618	[1737–3499]	13.4	[−1.9–28.8]	−1.0	[−3.9–2.0]
2	2.3	[0.3–4.2]	799	[207–1391]	−4.8	[−15.1–5.6]	−0.9	[−2.9–1.1]
3	1.7	[0.1–3.3]	296	[−178–770]	−6.0	[−14.3–2.3]	0.4	[−1.2–2.0]
BI at admission, one point more	−0.046	[−0.073–−0.018]	−22	[−31–−14]	−0.013	[−0.161–0.135]	−0.388	[−0.416–−0.360]
Preoperative ERCP only	8.2	[5.7–10.8]	2147	[1371–2924]	8.6	[−5.0–22.2]	2.2	[−0.5–4.8]
Preoperative BDI	13.7	[12.0–15.3]	5480	[4979–5982]	12.0	[3.1–20.8]	0.9	[−0.8–2.6]
Approach (for laparoscopic cholecystectomy)
Open cholecystectomy	7.9	[6.6–9.3]	1635	[1228–2041]	17.5	[10.1–24.9]	0.5	[−0.9–1.9]
IOC	0.2	[−4.3–4.7]	793	[−563–2149]	7.2	[−17.2–31.6]	−0.8	[−5.4–3.8]
Complication	4.7	[2.6–6.7]	1421	[806–2036]	***		−3.2	[−5.3–−1.1]
Teaching status (for community)
Academic	0.6	[−1.7–2.9]	427	[−217–1071]	30.7	[15.5–46]	−1.5	[−4.0–1.0]
Akaike informationcriteria	12199		29920		17355		12272

***not included in the regression model. CI: confidence interval. BDI: bile duct intervention.

ERCP: endoscopic retrograde cholangiopancreatography. IOC: intraoperative cholangiography.