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Table 1 Characteristics of study population by radiotherapy group and laterality

From: Increased cardiovascular mortality more than fifteen years after radiotherapy for breast cancer: a population-based study

  

No radiotherapy

Radiotherapy

p- value

  

Right

Left

Right

Left

 

Age (years)

Mean

58.1

58.4

54.5

54.8

< 0.001

 

S.D.

13.2

13.2

11.6

11.4

 

IMD quintile

1

1027 (21.9%)

1045 (20.8%)

1338 (24.6%)

1371 (24.0%)

< 0.001

 

2

932 (19.9%)

1066 (21.2%)

1135 (20.9%)

1183 (20.7%)

 
 

3

890 (19.0%)

928 (18.4%)

1023 (18.8%)

1095 (19.2%)

 
 

4

979 (20.9%)

1072 (21.3%)

1007 (18.5%)

1042 (18.3%)

 
 

5

760 (16.2%)

843 (16.8%)

871 (16.0%)

936 (16.4%)

 
 

N/K

106 (2.3%)

78 (1.6%)

67 (1.2%)

77 (1.4%)

 

Stage

1

2557 (54.5%)

2651 (52.7%)

2677 (49.2%)

2758 (48.4%)

< 0.001

 

2

316 (6.7%)

331 (6.6%)

566 (10.4%)

553 (9.7%)

 
 

3

523 (11.1%)

554 (11.0%)

1016 (18.7%)

1071 (18.8%)

 
 

4

103 (2.2%)

105 (2.1%)

89 (1.6%)

92 (1.6%)

 
 

N/K

1195 (25.5%)

1391 (27.6%)

1093 (20.1%)

1230 (21.6%)

 

Chemotherapy

No

4457 (95.0%)

4804 (95.5%)

5180 (95.2%)

5443 (95.4%)

0.602

 

Yes

237 (5.0%)

228 (4.5%)

261 (4.8%)

261 (4.6%)

 

Hormone Therapy

No

3445 (73.6%)

3785 (75.2%)

3904 (71.8%)

4127 (72.4%)

< 0.001

 

Yes

1239 (26.4%)

1247 (24.8%)

1537 (28.2%)

1577 (27.6%)

 

Follow-up (years)

Mean

20.31

20.46

19.26

19.19

< 0.001

 

S.D.

5.45

5.50

5.02

4.97

 
 

Median

19.57

19.73

17.94

17.86

< 0.001

Total cases

 

4694

5032

5441

5704