TABLE 2.
Descriptive characteristics of predictors
| Breast cancer (n = 264) | Control (n = 95) | Overall (n = 359) | |
|---|---|---|---|
| Hormone exposure factors | |||
| Number of pregnancies, mean (SD) | 2.28 (1.6) | 2.44 (1.6) | 2.32 (1.6) |
| Natural menopause, n (%) | 217 (84.1) | 81 (88) | 298 (85.1) |
| Years since menopause (natural or surgical), mean (SD) | 11.86 (7.5) | 10.13 (7.2) | 11.41 (7.4) |
| Reproductive life, mean (SD), y | 37.18 (4.6) | 36.68 (4.6) | 37.05 (4.6) |
| Ever used oral contraceptive, n (%) | 169 (64.3) | 73 (76.8) | 242 (67.6) |
| Years of oral contraceptive use, mean (SD)a | 3.45 (4.9) | 4.95 (5.8) | 3.86 (5.1) |
| Years since oral contraceptive use, mean (SD)a | 42.47 (17.8) | 36.34 (16.1) | 40.78 (17.5) |
| Ever used hormone therapy, n (%) | 140 (53.2) | 46 (48.4) | 186 (52.0) |
| Years of hormone therapy, mean (SD) | 3.24 (5.2) | 2.30 (4.2) | 2.97 (4.9) |
| Years since hormone therapy, mean (SD) | 31.68 (28.2) | 33.47 (26.4) | 32.16 (27.7) |
| Ever had oophorectomy, n (%) | 56 (21.3) | 17 (17.9) | 73 (20.4) |
| Years since oophorectomy, mean (SD) | 3.41 (8.1) | 2.82 (8.2) | 3.25 (8.1) |
| Other predictors | |||
| Age, mean (SD)a | 60.64 (6.2) | 58.88 (6.1) | 60.17 (6.2) |
| NART verbal IQ score, mean (SD)a | 108.09 (8.9) | 111.73 (9.6) | 109.11 (9.3) |
| BDI-II total, mean (SD) | 5.76 (6.3) | 5.34 (6.1) | 5.65 (6.2) |
| POMS tension/anxiety subscale, mean (SD) | 7.92 (5.7) | 6.78 (6.1) | 7.61 (5.8) |
| POMS fatigue/inertia subscale, mean (SD) | 5.56 (5.8) | 5.36 (5.4) | 5.50 (5.7) |
NART, National Adult Reading Test; BDI-II, Beck Depression Inventory-II; POMS, Profile of Mood States.
a
P < 0.05.