Table 1 Descriptive statistics for case and control subjects, and for case-control paired differences.
| Â | Mean (SD) | Case - Sister control | Case - Unrelated control | ||||
|---|---|---|---|---|---|---|---|
| Â | Case N = 228 | Control | Mean (SD) N = 228 | P valuec | Mean (SD) N = 228. | P valuec | |
| Â | Â | Sister N = 228 | Unrelated N = 228 | Â | Â | Â | Â |
Age at mammogram (years) | 50.7 (8.0) | 51.4 (8.1) | 50.9 (7.6) | - 0.68 (2.0) | <.0001 | -0.21 (0.8) | 0.0003 |
Weight (kg) | 68.9 (13.7) | 68.8a (16.2) | 67.0 (15.9) | 0.15 (17.0)a | 0.89 | 1.88 (20.1) | 0.16 |
Height (cm) | 163.3 (6.9) | 163.4b (6.2) | 162.5 (6.8) | - 0.02 (6.8)b | 0.96 | 0.81 (9.8) | 0.22 |
Body mass index (kg/m2) | 25.8 (4.7) | 25.8b(5.8) | 25.3 (5.4) | 0.07 (6.0)b | 0.87 | 0.48 (7.0) | 0.30 |
Menopausal status (% post) | 44.7 | 45.2 | 44.7 | -0.5 | 0.89 | 0 | 1.00 |
Parous (% yes) | 79.8 | 84.2 | 80.7 | -4.4 | 0.19 | -0.9 | 0.81 |
HRT ever used (% yes) | 41.7 | 34.4a | 37.3 | 7.3 | 0.08c | 4.4 | 0.30 |
HRT current use (% yes) | 29.8 | 22.4 | 29.8 | 7.4 | 0.04 | 0 | 1.00 |
Ethnicity (% white) | 92.1 | 92.1 | 93.0 | NA | NA | -0.9 | 0.72 |
Family history (% yes) | 48 | 100 | 23 | NA | NA | NA | NA |