Table 3.

Univariate and multivariate analysis for pathological lymph-node metastasis.

	Univariate analysis		Multivariate analysis
	OR (95% CI)	P value	OR (95% CI)	P value
Age (years)
≥ 75/ < 75	1.44 (0.64–3.31)	0.44
Sex
Male/female	3.43 (1.37–9.14)	< 0.01**	4.36 (1.43–13.3)	< 0.01**
Histology
Undifferentiated/differentiated	1.46 (0.65–3.29)	0.35
Pre-CEA (ng/ml)
≥ 5.0/ < 5.0	0.93 (0.36–2.39)	1.00
Pre-CA19-9 (U/ml)
≥ 37.0/ < 37.0	1.75 (0.62–5.15)	0.34
cT status
T3–4/T2	4.24 (1.82–10.26)	< 0.01**	4.10 (1.31–12.9)	0.02*
cN status
Positive/negative	4.88 (2.08–11.9)	< 0.01**	2.03 (0.75–5.50)	0.16
T-SUV max
≥ 4.32/ < 4.32	2.74 (1.20–6.4)	0.01*	0.58 (0.18–1.85)	0.36
N-SUV max
≥ 1.82/ < 1.82	21.0 (5.73–118.2)	< 0.01**	16.5 (3.84–70.5)	< 0.01**

OR odds ratio, CI confidence interval, pre preoperative, SUVmax  maximum standardized uptake value.

*P value < 0.05, **P value < 0.01.