Table 3.

Univariate and multivariable logistic regression analysis for factors extending operative duration^†

	Univariate analysis			Multivariable analysis
Variables	OR	95% CI	P‐value	OR	95% CI	P‐value
Age (≤50 vs. >50 years)	0.777	0.449–1.347	0.369	—	—	—
Sex (female vs. male)	1.246	0.718–2.160	0.433	—	—	—
Clinical symptom (yes vs. no)	1.431	0.783–2.616	0.243	—	—	—
Location (Group I vs. Group II and III)	1.234	0.700–2.174	0.467	—	—	—
Preoperative follow‐up time (≤2 vs. >2 years)	1.579	0.649–3.843	0.311	—	—	—
Maximal diameter (>5 vs. ≤5 cm)	1.998	1.111–3.558	0.019	2.106	1.147–3.865	0.016
Diagnosed as mediastinal cyst by CT (yes vs. no)	0.792	0.457–1.372	0.405	—	—	—
Mediastinal structure damage (yes vs. no)	10.475	2.062–53.221	0.001	10.875	2.015–58.681	0.006
Adhesions to mediastinal structure (yes vs. no)	2.378	1.353–4.221	0.002	2.345	1.303–4.223	0.005

^†The operation time prolonged is defined as the operation time was more than 120 minutes.