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Table 1 Descriptive characteristics of breast cancer cases (probands) from the US Radiologic Technologist study and their first degree relatives with and without breast cancer.

From: Kin-cohort estimates for familial breast cancer risk in relation to variants in DNA base excision repair, BRCA1 interacting and growth factor genes

Characteristic at time of interview (1999–2001) Radiologic technologists with breast cancer* (n = 748) First degree female relatives with breast cancer (n = 190) First degree female relatives without breast cancer (N = 2240)
  N % N % N %
Year of birth       
   <1900 0 0.0 19 10.0 165 7.4
   1900–29 155 20.7 110 57.9 702 31.3
   1930–39 202 27.0 28 14.7 234 10.5
   1940–49 276 36.9 20 10.5 271 12.1
   1950–59 115 15.4 10 5.3 304 13.6
   ≥1960+ 0 0.0 3 1.6 564 25.2
Calendar year of breast cancer diagnosis       
   <1975 43 5.8 56 29.5 NA** ---
   1975–79 42 5.6 16 8.4 NA ---
   1980–84 98 13.1 20 10.5 NA ---
   1985–89 172 23.0 35 18.4 NA ---
   1990–94 313 41.8 31 16.3 NA ---
   ≥1995 80 10.7 32 16.8 NA ---
Age at diagnosis       
   <40 114 15.2 22 11.6 NA ---
   40–49 299 40.0 28 14.7 NA ---
   50–59 203 27.1 42 22.1 NA ---
   60–69 90 12.0 49 25.8 NA ---
   ≥70 42 5.6 49 25.8 NA ---
Relationship to the radiologic technologist (index proband)  
   Mother NA --- 98 51.6 648 28.9
   Sister NA --- 85 44.7 882 39.4
   Daughter NA --- 7 3.7 710 31.7
  1. * Includes invasive breast cancer and ductal carcinoma in situ **NA is Not applicable