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Table 3 Chest diagnostic/screening X-ray exposure characteristics by medical procedures

From: Diagnostic chest X-rays and breast cancer risk among women with a hereditary predisposition to breast cancer unexplained by a BRCA1 or BRCA2 mutation

Characteristicsa

Cases

N = 1552

Controls

N = 1363

No.

%

No.

%

Conventional radiography + fluoroscopy

 Never

213

13.7

242

17.8

 Ever

1,296

83.5

1,097

80.5

 Missing

43

2.8

24

1.8

Number of lifetime exposures

 1–3

377

24.3

379

27.8

 4–9

248

16.0

195

14.3

 ≥10

258

16.6

213

15.6

 Missing

456

29.4

334

24.5

Age at first exposure (years)

 Mean (sd)

20.4 (10.9)

 

22.0 (12.5)

 

 Missing

291

18.8

202

14.8

Tomography

 Never

1,389

89.5

1,276

93.6

 Ever

48

3.1

40

2.9

 Missing

115

7.4

47

3.5

Number of lifetime exposures

 1

37

2.4

30

2.2

 ≥2

9

0.6

9

0.7

 Missing

117

7.5

48

3.5

Age at first exposure (years)

 Mean (sd)

40.0 (15.8)

 

42.8 (15.4)

 

 Missing

115

7.4

47

3.5

Scintigraphy

 Never

1,416

91.2

1,294

94.9

 Ever

21

1.4

22

1.6

 Missing

115

7.4

47

3.5

Number of lifetime exposures

 1

18

1.2

18

1.3

 ≥2

3

0.2

4

0.3

 Missing

115

7.4

47

3.5

Age at first exposure (years)

 Mean (sd)

50.8 (10.2)

 

53.4 (12.0)

 

 Missing

115

7.4

47

3.5

Mammography

 Never

266

17.1

102

7.5

 Ever

1271

81.9

1252

91.9

 Missing

15

1.0

9

0.7

  1. a Lifetime exposures up to one year prior to diagnosis for cases and up to one year prior to date of questionnaire completion for controls