Table 3 Univariate logistic regression analysis of the risk factors for grade ≥ 2 radiation pneumonitis

MLD

0.001

1.55 (1.20–1.99)

Total lung V5

0.006

1.08 (1.02–1.14)

Total lung V10

0.004

1.13 (1.04–1.22)

Total lung V15

0.002

1.18 (1.06–1.31)

Total lung V20

0.001

1.25 (1.09–1.42)

Total lung V30

0.001

1.36 (1.13–1.64)

Ipsilateral lung V5

0.002

1.08 (1.03–1.14)

Ipsilateral lung V10

0.002

1.10 (1.04–1.17)

Ipsilateral lung V15

0.002

1.12 (1.04–1.20)

Ipsilateral lung V20

0.001

1.15 (1.06–1.25)

Ipsilateral lung V30

0.001

1.20 (1.08–1.34)