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Table 2 The population attributable risks and estimated number of new cancer cases in Korean women caused by modifiable reproductive factors in the year 2010

From: Population attributable risks of modifiable reproductive factors for breast and ovarian cancers in Korea

Cancer site Risk factors Population attributable risks % (95 % CI) Attributed N of casesc
Breast Pregnancy/age at first birth 8.0 (7.4-8.6) 1152 (1066–1246)
  (Nullipara or age at first birth ≥ 24 years)
  Total period of breast feedinga 3.1 (3.1-3.2) 453 (441–464)
(Duration of breast feeding ≤ 6 months)
  Oral contraceptive use (Ever) 5.3 (5.1-5.5) 763 (732–795)
  Hormone replacement therapy use (Ever)b 0.3 (0.2-0.3) 37 (29–44)
  Total 16.7 (15.8-17.6) 2404 (2283–2535)
Ovary Pregnancy (Nulliparous) 1.2 (1.2-1.2) 24 (24–24)
  Breast feeding experience (Never)a 2.9 (2.8-2.9) 55 (55–56)
  Tubal ligation (No)a 24.5 (23.0-26.2) 473 (444–504)
  Oral contraceptive use (Never) 53.3 (27.9-100.0d) 1027 (537–1927)
  Total 81.9 (55.0-100.0 d) 1579 (1059–1927)
    Attributed % of cases
  % of breast cancer in women   16.7 (15.8-17.6)
  % of ovary cancer in women   81.9 (55.0-100.0d)
  1. aPAFs were considered only for parous females (97 % of total females)
  2. bPAFs were considered only for post-menopausal females (32 % for total females)
  3. cAttributable number of cases = population attributable risk X numbers of breast or ovarian cancer incidence in the year 2010 from National Cancer Registry
  4. dThe population attributable risk exceed 100 (102.1) and truncated to 100