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Table 1 Characteristics by CCL status among controls with BBD*

From: Columnar cell lesions and subsequent breast cancer risk: a nested case-control study

  CCL No CCL
No. of controls (%) 448 (27.9) 1,158 (72.1)
Means   
   Age at BBD biopsy, years 45.1 43.3
   Year of BBD biopsy (median) 1979 1979
   Time since BBD biopsy, years 9.3 10.1
   No. of BBD biopsy slides† 5.7 5.5
   Body mass index, kg/m2 24.2 25.0
   Body mass index at age 18, kg/m2 20.5 21.1
   Weight gain after age 18, kg† 10.0 10.7
   Age at menarche, years† 12.7 12.6
   Age at first birth, years (parous only)† 24.9 24.9
   Alcohol intake, g/day† 4.2 4.0
   Parity (parous only)† 3.0 3.0
Percentages   
   Premenopausal† 36.0 35.5
   Parous† 91.9 92.4
   First degree family history of breast cancer† 19.0 17.6
   Ever postmenopausal hormone use† 32.0 37.3
   Ever oral contraceptive use† 45.1 49.6
   Histologic category of BBD†   
Nonproliferative 21.5 44.4
Proliferative without atypia 61.8 48.4
Atypical hyperplasia 16.8 7.2
  1. CCL indicates columnar cell lesions; BBD, benign breast disease.
  2. *Unless otherwise specified, all variables correspond to the time period immediately prior to the index date.
  3. †Means and percentages were standardized to the age distribution of the controls at the time of benign biopsy, in five-year categories.