Table 5.

Multiple regression models for operation time per session and variables including surgical procedure.

Variable	Estimate	95% CI	p
Intercept	1.39	0.60–2.19	<0.01
Surgical procedure
OSS	0 (reference)
TSS	−0.13	−0.24 to −0.01	0.03
Age
Per year	−0.002	−0.012–0.007	0.63
Tumor type
SCC	0 (reference)
BCC	0.023	−0.11–0.007	0.73
Tumor diameter
Per mm	0.003	−0.008–0.013	0.61
Excisional margin
Per mm	0.02	−0.04–0.09	0.48
Vertical defect location
Below adipose tissue	0 (reference)
Within adipose tissue	−0.27	−0.41 to −0.14	<0.001
Anatomical site
Others	0 (reference)
Mask area	0.0002	−0.12–0.12	0.10

CI, confidence interval; TSS, two-step surgery; OSS, one-step surgery; BCC, basal cell carcinoma; SCC, squamous cell carcinoma. p < 0.05.

Value with p < 0.05 were bold.