Table 3 Multivariate analysis for survival outcome

Age, y (> 45 vs. ≤ 45)

0.774 (0.454–1.318)

0.345

0.986 (0.542–1.796)

0.964

Maximum tumor diameter

1.379

0.264

2.023

0.021

 (> 40 mm vs. ≤ 40 mm)

(0.785–2.422)

(1.114–3.672)

Histology

0.832

0.695

0.440

0.045

 (SCC vs. non-SCC)

(0.331–2.087)

(0.197–0.982)

Pre-RT hemoglobin (g/L)

0.654

0.100

0.788

0.406

 (> 110 vs. ≤ 110)

(0.394–1.084)

(0.449–1.383)

Treatment

 Surgery + adjuvant RT

1.441

0.170

1.466

0.195

 vs. radical RT

(0.856–2.428)

(0.822–2.615)