Table 1.

Distribution of select characteristics according to adult BMI among women with invasive breast cancer

CharacteristicAll (N = 3,924) %Adult BMI (kg/m2)
≤22.99 (n = 2,331), %23.00-24.99 (n = 666), %25.00-29.99 (n = 664), %≥30.00 (n = 263), %
Age at diagnosis (y)*
    20-3924.827.422.419.420.9
    40-4523.524.921.922.019.4
    46-4922.122.321.620.924.3
    50-5529.625.434.137.735.4
Race*
    White87.590.685.682.875.3
    Black/other12.59.414.117.224.7
Menopausal status*
    Premenopause47.051.043.139.939.5
    Perimenopause18.016.619.120.321.7
    Natural menopause13.111.415.616.015.2
    Surgical menopause—no ovaries7.87.27.59.88.4
    Surgical menopause— ≥1 ovary14.113.814.714.015.2
First-degree family history of breast cancer11.712.211.710.79.5
Frequency of breast examinations
    At least once per month24.523.426.925.227.0
    Several times a year26.226.426.025.327.4
    Once per year or less49.150.146.949.145.6
Previous mammogram16.116.017.617.311.0
Frequency of Pap smears*
    At least once per year72.275.371.967.357.0
    Less than once per year27.724.528.132.442.6
History of benign breast disease16.117.316.513.611.4
Cancer stage at diagnosis*
    Local51.454.047.048.247.5
    Regional45.443.649.147.745.6
    Distant3.22.43.94.16.8
Histologic type
    Ductal69.670.067.170.669.6
    Lobular8.69.39.56.07.2
    Other21.820.823.423.423.2
Radiation therapy22.423.322.820.319.4
Educational level (y)*
    <1212.68.615.519.125.1
    12-1563.662.565.264.367.7
    16+23.829.019.416.66.8
Number of comorbidities*,§
    None62.871.760.547.927.8
    126.722.428.235.239.9
    28.04.69.013.122.4
    3+2.51.42.33.89.9
  • NOTE: Because of rounding or missing information, some column percentages do not add to 100.

  • * P < 0.001: Pearson χ2 test.

  • Before being diagnosed with a breast problem (lumps, cysts, or other problem).

  • P < 0.05: Pearson χ2 test.

  • § Diabetes, high blood pressure, blood clots, kidney disease, gallbladder disease, heart attack, paralysis, rheumatoid arthritis, stroke, other cancer.