Table 4 Ordinal logistic regression analysis for maximal grade dermatitis radiation (CTCAE v.4.03)

Country of origin

Middle East vs. Asia vs. Africa vs. Europe or U.S.A.

0.17

Age at diagnosis (years)

≤median vs. >median

0.61

Volume of the PTV (cm³)

≤median vs. >median

0.01

0.0002

1.52

0.72

2.32

BMI

<25 vs. 25.0–29.9 vs. 30.0–34.9 vs. 35.0–39.9 vs. ≥40.0

0.03

Menopausal status

Pre- vs. post-menopausal

0.56

T classification

Tis, T0,T1,T2 vs. T3,T4

0.51

N classification

N0 vs. N1, N2, N3

0.28

Grading

G1, G2 vs. G3

0.61

ER status

Negative vs. positive

0.98

PR status

Negative vs. positive

0.79

Her2/neu status

Negative vs. positive

0.38

Fractionation regimen

CF vs. HF

<0.0001

<0.00001

2.14

1.32

3.33

Planning Target Volume (PTV)

Breast vs. chest wall

0.02

Locoregional lymph nodes treated as part of plan

Yes vs. no

0.76

Radiation technique

3DCRT vs. TB-IMRT

0.42

Chemotherapy

Neoadjuvant vs. adjuvant vs. no chemotherapy

0.22

Hormonal therapy

Yes vs. no

0.60