Table 1.
Characteristic | Cases (n=417) n (%) |
Controls (n=395) n (%) |
p value | Age-Adjusted OR (95% CI) |
---|---|---|---|---|
Education | ||||
High school or less | 154 (36.9) | 134 (33.9) | 0.06 | 1.00 |
College | 183 (43.9) | 158 (40.0) | 0.92 (0.66–1.27) | |
Graduate school | 80 (19.2) | 103 (26.1) | 0.60 (0.41–0.88) | |
Race/Ethnicity | ||||
White | 355 (85.3) | 349 (88.8) | 0.04 | 1.00 |
Black | 36 (8.7) | 17 (4.3) | 1.96 (1.08–3.57) | |
Other | 10 (2.4) | 16 (4.1) | 0.54 (0.24–1.21) | |
Hispanic (any race) | 15 (3.6) | 11 (2.8) | 1.14 (0.51–2.54) | |
Parity | ||||
0–1 | 147 (35.3) | 92 (23.3) | <0.01 | 1.00 |
2 | 142 (34.1) | 140 (35.4) | 0.64 (0.45–0.90) | |
≥3 | 128 (30.7) | 163 (41.3) | 0.53 (0.37–0.76) | |
Oral Contraceptive Use | ||||
Never | 224 (53.7) | 199 (50.4) | 0.34 | 1.00 |
Ever | 193 (46.3) | 196 (49.6) | 0.69 (0.51–0.93) | |
HRT Use | ||||
Never | 335 (80.3) | 291 (73.7) | 0.02 | 1.00 |
Unopposed E only | 34 (8.2) | 31 (7.9) | 0.97 (0.58–1.63) | |
Any combined HRT | 48 (11.5) | 73 (18.5) | 0.54 (0.36–0.81) | |
Age at Menarche | ||||
>13 | 74 (17.8) | 102 (25.9) | 0.02 | 0.66 (0.46–0.95) |
12–13 | 233 (56.0) | 198 (50.3) | 1.00 | |
≤11 | 109 (26.2) | 94 (23.9) | 0.93 (0.66–1.31) | |
Menopause | ||||
Premenopausal | 59 (14.2) | 48 (12.2) | 0.92 | |
Postmenopausal | 358 (85.9) | 347 (87.9) | ||
Age at menopause | ||||
<40 | 13 (3.1) | 12 (3.0) | 0.97 (0.43–2.21) | |
41–54 | 254 (60.9) | 243 (61.5) | 1.00 | |
≥55 | 41 (9.8) | 39 (9.9) | 1.11 (0.68–1.80) | |
Unknown | 50 (12.0) | 53 (13.4) | 0.91 (0.59–1.40) | |
BMI | ||||
Normal (<25) | 105 (25.2) | 189 (47.9) | <0.01 | 1.00 |
Overweight (25–29.9) | 121 (29.0) | 119 (30.1) | 1.93 (1.36–2.75) | |
Obese (30–34.9) | 68 (16.3) | 62 (15.7) | 2.02 (1.32–3.08) | |
Very obese (≥35) | 123 (29.5) | 25 (6.3) | 8.47 (5.16–13.89) | |
Smoking status | 0.24 | |||
Never | 231 (55.4) | 207 (52.7) | 1.00 | |
Past | 159 (38.1) | 148 (37.7) | 0.97 (0.72–1.30) | |
Current | 27 (6.5) | 38 (9.7) | 0.58 (0.34–0.98) |