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Table 1 Summary characteristics for affected and unaffected carriers

From: Parity and breast cancer risk among BRCA1 and BRCA2mutation carriers

Parameter Total Affected Unaffected
   BRCA1 BRCA2 BRCA1 BRCA2
Number of carriers, n 789 248 209 218 114
Age at censoring, years (mean ± SD) 45.0 ± 11.3 42.9 ± 9.6 43.9 ± 9.3 46.8 ± 13.0 48.3 ± 13.0
Year of birth, n (%)      
   Before 1940 247 78 (31.5) 64 (30.6) 78 (35.8) 27 (23.7)
   1940 to 1949 185 69 (27.8) 61 (29.2) 40 (18.3) 15 (13.2)
   1950 to 1959 169 58 (23.4) 48 (23.0) 34 (15.6) 29 (25.4)
   1960 and after 188 43 (17.3) 36 (17.2) 66 (30.3) 43 (37.7)
Censoring age, n (%)      
   <55 years 670 226 (91.1) 185 (88.5) 172 (78.9) 87 (76.3)
   ≥55 years 119 22 (8.9) 24 (11.5) 46 (21.1) 27 (23.7)
Oophorectomy before censoring age, n 45 5 7 25 8