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Documentation for the Risk Factors Dataset

This table explains how to read the data in the Risk Factors Dataset. It is also included in the download for the dataset.

Variable Name Description Coding
year Calendar year of observation Numerical, 2000-2009
age_group_5_years Age (years) in 5 year groups
  • 1 = Age 18-29
  • 2 = Age 30-34
  • 3 = Age 35-39
  • 4 = Age 40-44
  • 5 = Age 45-49
  • 6 = Age 50-54
  • 7 = Age 55-59
  • 8 = Age 60-64
  • 9 = Age 65-69
  • 10 = Age 70-74
  • 11 = Age 75-79
  • 12 = Age 80-84
  • 13 = Age >85
race_eth Race/ethnicity
  • 1 = Non-Hispanic white
  • 2 = Non-Hispanic black
  • 3 = Asian/Pacific Islander
  • 4 = Native American
  • 5 = Hispanic
  • 6 = Other/mixed
  • 9 = Unknown
first_degree_hx History of breast cancer in a first degree relative
  • 0 = No
  • 1 = Yes
  • 9 = Unknown
age_menarche Age (years) at menarche
  • 0 = Age >14
  • 1 = Age 12-13
  • 2 = Age <12
  • 9 = Unknown
age_first_birth Age (years) at first birth
  • 0 = Age < 20
  • 1 = Age 20-24
  • 2 = Age 25-29
  • 3 = Age >30
  • 4 = Nulliparous
  • 9 = Unknown
BIRADS_breast_density BI-RADS breast density
  • 1 = Almost entirely fat
  • 2 = Scattered fibroglandular densities
  • 3 = Heterogeneously dense
  • 4 = Extremely dense
  • 9 = Unknown or different measurement system
current_hrt Use of hormone replacement therapy
  • 0 = No
  • 1 = Yes
  • 9 = Unknown
menopaus Menopausal status
  • 1 = Pre- or peri-menopausal
  • 2 = Post-menopausal
  • 3 = Surgical menopause
  • 9 = Unknown
bmi_group Body mass index
  • 1 = 10-24.99
  • 2 = 25-29.99
  • 3 = 30-34.99
  • 4 = 35 or more
  • 9 = Unknown
biophx Previous breast biopsy or aspiration
  • 0 = No
  • 1 = Yes
  • 9 = Unknown
breast_cancer_history Prior breast cancer diagnosis
  • 0 = No
  • 1 = Yes
  • 9 = Unknown
count Frequency count of this combination of covariates Numerical

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