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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