Variable | Cases (n = 393) | Controls (n = 436) | P |
---|---|---|---|
Age at menarche (years) | |||
<11 | 23 (5.9) | 29 (6.7) | |
11–12 | 152 (39.2) | 168 (38.6) | |
≥ 12 | 213 (54.9) | 238 (54.7) | 0.907 |
Menopausal status | |||
Premenopausal | 88 (22.4) | 146 (33.5) | |
Postmenopausal | 305 (77.6) | 290 (66.5) | 0.000 |
Age at menopause (years) | |||
<44 | 76 (25.8) | 91 (32.3) | |
44–49 | 105 (35.6) | 87 (30.9) | |
≥ 49 | 114 (38.6) | 104 (36.8) | 0.202 |
Lifetime lactation (months) | |||
0 | 242 (61.6) | 260 (59.6) | |
1–5 | 50 (12.7) | 61 (14.0) | |
6–15 | 56 (14.3) | 59 (13.5) | |
≥ 15 | 45 (11.4) | 56 (12.9) | 0.853 |
Family history of breast cancer in first-degree relatives | |||
Yes | 94 (24.0) | 98 (22.5) | |
No | 299 (76.0) | 338 (77.5) | 0.623 |
Body mass index (kg/m2) | |||
<25.0 | 72 (18.3) | 77 (17.7) | |
25.0–29.9 | 100 (25.5) | 110 (25.2) | |
≥ 30.0 | 221 (56.2) | 249 (57.1 | 0.960 |
Fat intake | |||
Low | 120 (31.0) | 141 (33.2) | |
Medium | 132 (34.1) | 143 (33.6) | |
High | 135 (34.9) | 141 (33.2) | 0.786 |
Cigarette smoking | |||
Never | 169 (43.0) | 196 (45.0) | |
Ever | 224 (57.0) | 239 (55.0) | 0.534 |
Alcohol consumption | |||
Never | 66 (19.2) | 64 (16.9) | |
Ever | 277 (80.8) | 315 (83.1) | 0.411 |
Annual income | |||
Low | 126 (39.0) | 125 (33.4) | |
Medium | 121 (37.5) | 133 (35.6) | |
High | 76 (23.5) | 116 (31.0) | 0.074 |
Study site | |||
New Haven County | 266 (67.7) | 282 (64.7) | |
Tolland County | 127 (32.3) | 154 (35.3) | 0.361 |
Live births | |||
0 | 46 (11.95) | 66 (15.46) | |
1–2 | 200 (51.95) | 202 (47.31 | |
≥ 2 | 139 (36.10) | 159 (37.24) | 0.252 |