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Table 1 Characteristics of 102,927 women from the Generations Study, recruited 2003–2013

From: Smoking and risk of breast cancer in the Generations Study cohort

Study population No. of subjects %
Year of birth
 1908–1939 5917 5.8
 1940–1949 21,488 20.9
 1950–1959 24,735 24.0
 1960–1969 23,749 23.1
 1970–1996 27,038 26.3
Year of recruitment
 2003–2005 33,807 32.9
 2006–2007 48,489 47.1
 2008–2013 20,631 20.0
Age at recruitment, years
 16–34 23,289 22.6
 35–44 23,116 22.5
 45–54 24,385 23.7
 55–64 23,837 23.2
 65–74 7308 7.1
 75–102 992 1.0
Age at menarche, years
 7–11 20,658 20.1
 12–14 62,291 60.5
 15–19 9353 9.1
 Not known or anomalousa 10,625 10.3
Family history of breast cancer in first-degree relatives
 No 87,030 84.6
 Yes 15,897 15.4
Smoking status, at entry into cohort
 Never smoked 66,013 64.1
 Current smoker 8491 8.3
 Former smoker 28,300 27.5
 Ever smoker, status unknown at this time 123 0.1
Alcohol consumption, at entry into cohort
 Never regular 10,574 10.3
 Current drinker (< 60 g/day) 63,690 61.9
 Current drinker (≥ 60 g/day) 1280 1.2
 Current drinker, amount unknown 4306 4.2
 Former drinker 13,513 13.1
 Ever drinker, status unknown at this time 9564 9.3
Total number of subjects 102,927 100.0
  1. Total number of subjects excludes 13 women (including 1 who developed breast cancer) with self-contradictory information for parity or smoking
  2. aIncludes 2 women reporting menarche before age 5 years, 23 at ages 20–33 years, and 23 reporting never having periods