Table A1.
Selected Baseline or Breast Cancer Characteristics of Respondents and Nonrespondents to the 2004 IWHS Follow-Up Survey With Unilateral Breast Cancer Between 1986 and 2003
| Characteristic | % of Patients
|
|||
|---|---|---|---|---|
| All Respondents (n = 1,287) | Nonrespondents
|
|||
| All (n = 1,370) | Alive in 2004 (n = 651) | Died Before 2004 (n = 719) | ||
| Age at baseline, years | ||||
| Mean | 61.0 | 62.6 | 62.3 | 63.0 |
| SE | 0.1 | 0.1 | 0.2 | 0.2 |
| Age at diagnosis, years | ||||
| Mean | 71.0 | 71.0 | 72.2 | 70.0 |
| SE | 0.2 | 0.2 | 0.2 | 0.2 |
| Time since breast cancer diagnosis, years | ||||
| Mean | 8.1 | 8.2 | ||
| SE | 0.1 | 0.2 | ||
| Baseline BMI ≥ 25 kg/m2 | 63.9 | 66.8 | 65.6 | 67.9 |
| Comorbidity index, yes* | 57.2 | 56.5 | 52.2 | 60.4 |
| Tumor size, mm* | ||||
| < 10 mm | 29.7 | 21.7 | 28.3 | 16.7 |
| 10-19 mm | 36.4 | 31.0 | 34.9 | 27.4 |
| ≥ 20 mm | 23.8 | 35.5 | 26.4 | 43.7 |
| Unknown | 10.1 | 11.7 | 10.5 | 12.2 |
| Breast cancer stage* | ||||
| In situ | 13.1 | 9.6 | 12.8 | 7.1 |
| Local | 58.2 | 52.4 | 58.0 | 48.5 |
| Regional/distant | 13.9 | 28.6 | 16.1 | 38.7 |
| Unstaged | 14.6 | 9.3 | 13.1 | 5.7 |
| Type of surgery* | ||||
| No surgery | 17.6 | 14.6 | 1.1 | 4.6 |
| Lumpectomy | 17.1 | 15.2 | 35.0 | 20.3 |
| Simple | 14.5 | 12.7 | 4.2 | 3.3 |
| Radical | 48.7 | 53.5 | 46.5 | 67.3 |
| Other | 4.0 | 4.0 | 0.8 | 4.5 |
| Breast cancer histologic type† | ||||
| Ductal | 78.1 | 73.3 | 76.2 | 71.5 |
| Lobular | 7.6 | 8.4 | 7.2 | 9.2 |
| Mixed | 6.0 | 4.7 | 5.2 | 4.0 |
| Other | 8.4 | 13.6 | 11.4 | 15.3 |
| ER status† | ||||
| Positive | 65.6 | 62.9 | 65.3 | 60.4 |
| Negative | 11.5 | 13.0 | 10.6 | 15.4 |
| Unknown | 23.0 | 24.1 | 24.1 | 24.2 |
| PR status† | ||||
| Positive | 54.4 | 52.6 | 54.8 | 50.2 |
| Negative | 19.3 | 21.1 | 18.6 | 23.4 |
| Unknown | 26.3 | 26.3 | 26.6 | 26.4 |
| No. of nodes examined†‡ | ||||
| Mean | 11.1 | 10.8 | 10.2 | 11.4 |
| SE | 0.2 | 0.3 | 0.3 | 0.4 |
| Positive lymph nodes present, SEER†‡ | 14.4 | 25.8 | 14.8 | 29.5 |
NOTE. Respondents include Iowa Women's Health Study (IWHS) women with unilateral breast cancer (according to Surveillance, Epidemiology, and End Results [SEER]) who responded to the 2004 follow-up and answered questions about lymphedema and arm symptoms on follow-up. Nonrespondents include all other IWHS women with unilateral breast cancer.
Abbreviations: BMI, body mass index; ER, estrogen receptor; PR, progesterone receptor.
Derived from baseline and follow-up questionnaires; includes participants with a history of hypertension, heart disease, and/or diabetes.
Data from SEER.
Information on nodes only available since 1988; women diagnosed with unilateral breast cancer during or after 1988 are included (total, n = 1,210; alive, n = 614; dead, n = 596).