Table 5 Results of Cox proportional hazards analysis after adjusting for modalities, xerostomia, mucositis, dermatitis, body weight loss, dysphagia, fistula formation, anemia, leucopenia and thrombocytopenia

IGRT vs Non-IGRT

0.46

0.22–0.97

0.042

0.18

0.06–0.56

0.003

^aXerostomia (Acute)

0.92

0.45–1.88

0.813

1.32

0.53–3.33

0.554

Mucositis

0.73

0.42–1.27

0.270

0.93

0.41–2.11

0.856

Dermatitis

1.05

0.68–1.63

0.821

0.60

0.32–1.11

0.103

Body weight loss

1.31

0.68–2.54

0.427

0.32

0.09–1.13

0.076

Dysphagia

0.93

0.60–1.45

0.762

0.56

0.27–1.19

0.122

Fistula formation or superficial cases of skin dehiscence

0.00

0.00–0.00

0.978

0.00

0.00–0.00

0.985

Anemia

2.57

1.16–5.67

0.020

5.83

2.22–15.31

0.000

Leucopenia

1.08

0.67–1.73

0.766

0.85

0.47–1.54

0.588

Thrombocytopenia

0.62

0.29–1.33

0.220

0.59

0.23–1.38

0.206