Table 1 Unmatched and propensity score-matched baseline characteristics.

From: Propensity-score-matched evaluation of the incidence of radiation pneumonitis and secondary cancer risk for breast cancer patients treated with IMRT/VMAT

Patient characteristics

 

Unmatched Cohort

Propensity Matched Cohort

IMRT n = 32 (%)

VMAT n = 58 (%)

p

IMRT n = 32 (%)

VMAT n = 32 (%)

p

Age

Mean

53

50

0.47

53

51

0.88

 

Range

28–70

33–75

 

28–70

33–74

 
 

≦40

3 (9)

10 (17)

 

3 (9)

4 (12)

 
 

41–50

8 (25)

16 (28)

 

8 (25)

9 (28)

 
 

51–60

14 (44)

19 (33)

 

14 (44)

12 (38)

 
 

>61

7 (22)

13 (22)

 

7 (22)

7 (22)

 

SCF

NO

13 (41)

40 (69)

0.60

13 (41)

21 (66)

0.60

 

Yes

19 (59)

18 (31)

 

19 (59)

11 (34)

 

AJCC stage

1

16 (50)

37 (64)

0.03

16 (50)

16 (50)

1.00

 

2

5 (16)

10 (17)

 

5 (16)

5 (16)

 
 

3

11 (34)

11 (17)

 

11 (34)

11 (34)

 

T stage

1

12 (38)

32 (56)

0.53

12 (38)

15 (47)

0.77

 

2

18 (56)

22 (38)

 

18 (56)

14 (44)

 
 

3

2 (6)

2 (3)

 

2 (6)

2 (6)

 
 

4

0

2 (3)

 

0

1 (3)

 

N stage

0

14 (44)

37 (64)

0.13

14 (44)

17 (53)

0.94

 

1

8 (25)

12 (21)

 

8 (25)

6 (19)

 
 

2

4 (13)

5 (9)

 

4 (13)

5 (15)

 
 

3

6 (19)

4 (6)

 

6 (19)

4 (13)

 

Chemotherapy

NO

10 (31)

29 (50)

0.67

10 (31)

16 (50)

0.67

 

Yes

22 (69)

29 (50)

 

22 (69)

16 (50)

 

RP

Grade 0

14 (44)

29 (50)

 

14 (44)

19 (59)

 
 

Grade 1

10 (31)

20 (34)

 

10 (31)

10 (31)

 
 

Grade 2

7 (22)

7 (11)

 

7 (22)

2 (6)

 
 

Grade 3

1 (3)

2 (4)

 

1 (3)

1 (3)

 
  1. Abbreviation: IMRT: intensity modulated radiotherapy; VMAT: volumetric modulated arc therapy; SCF: irradiation to supraclavicular fossa; AJCC American Joint Committee on Cancer; RP: radiation-induced pneumonitis.
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